Skip to content
Menu
  • MMA Rankings
    • Current MMA Rankings
      • Men’s MMA Ranking
        • Pound for Pound
        • Division Point Dominance
        • Heavyweight+
        • Light Heavyweight
        • Middleweight
        • Welterweight
        • Lightweight
        • Featherweight
        • Bantamweight
        • Flyweight
        • Strawweight
      • Women’s MMA Rankings
        • Women’s Pound for Pound
        • Women’s Division Point Dominance
        • Women’s Featherweight+
        • Women’s Bantamweight
        • Women’s Flyweight
        • Women’s Strawweight
        • Women’s Atomweight
      • Unknown Division
    • All-Time MMA Rankings
      • About All-Time Rankings
      • All-Time Absolute
      • All-Time Womens (Open)
      • All-Time Heavyweight+
      • All-Time LightHeavyweight
      • All-Time Middleweight
      • All-Time Welterweight
      • All-Time Lightweight
      • All-Time Featherweight
      • All-Time Bantamweight
      • All-Time Flyweight
      • All-Time Strawweight
    • Historical MMA Rankings
      • Published Ranking Snapshots
      • Generated Historical Rankings
  • Records & Statistics
    • Unusual Decisions
    • MMA Fight Outcomes by Weight Class
    • MMA Fight Outcomes by Year
    • Most Wins in MMA Bouts
    • Most Losses in MMA Bouts
    • Most Professional MMA Bouts
    • Most Career Wins Without a Loss
    • Longest Undefeated Streak (Active Fighters)
    • Longest Undefeated Streak (Retired Fighters)
    • Shortest Average Fight
    • Shortest Average Win
    • Best (T)KO Win Percentage
    • Best Submission Win Percentage
    • Most weight divisions fought in
    • Most weight divisions with draw or win
    • Longest Career
    • Database Statistics
  • Features
    • Interviews
    • Blogs
      • Boxing
      • MMA
      • Muay Thai
      • Event Previews
      • Fighter Highlights
      • MMA Ranks
      • Historical Ranks
      • MMA Statistics
      • News
    • MMA Promotions Ranking
    • Weekly Ranking Summary
      • Biggest Movers
      • Recently Active
      • Newly Ranked
      • Dropouts
      • Division Changes
      • Inactive Fighters
      • Quality Performance Decay
      • Strength of Schedule
    • Lineal Championship Histories
      • About Lineal Championships
      • Heavyweights
      • Light Heavyweights
      • Middleweights
      • Welterweights
      • Lightweights
      • Featherweights
      • Bantamweights
      • Flyweights
      • Strawweights
      • Women’s Featherweight+
      • Women’s Bantamweight
      • Women’s Flyweight
      • Women’s Strawweight
      • Women’s Atomweight
    • Upcoming Events
      • All Upcoming Events
      • Upcoming UFC Events
      • Upcoming MMA Events by Promotion
      • Upcoming MMA Events by Country
    • Past Events
      • Event Search
      • Past Events by Promotion
      • Past Events by Year
    • MMA Awards
    • Links and Mentions
  • UFC Records
    • About UFC Records
    • Most Wins
    • Most Bouts
    • Consecutive Wins
    • Title Wins
    • Title Bouts
    • Title Defenses
    • Octagon Time
    • UFC ‘Of the Night’ Bonuses
      • All Bonuses
      • Fights of the Night
      • Performances of the Night
      • Knockouts of The Night
      • Submissions of the Night
    • UFC Fight Outcomes by Weight Class
    • UFC Fight Outcomes By Year
  • About Us
    • About MMA Rankings
    • FAQ
    • Contact Us
  • Search
    • Fighter Search
    • Event Search
    • Blog Search
Close Menu
Fight Matrix
Best Betting Sites in Philippines at MightyTips.ph
Best Betting Sites in Philippines at MightyTips.ph

Tetsuya Yamada

  Tetsuya Yamada's profile at Sherdog 

Tetsuya Yamada's profile at Tapology 

Birth Date: 1990-04-02
Last 5: L W D W W
Association: E.D.O. Yokosuka Base
Pro Debut Date: 2007-09-09
Pro Record: 30-8-3
Current Ranking:
#562 Welterweight
'Big League' Record: 4-6-1
Last 3 Years: 3-0-1
Win Finish %: 73.3%
Combat Age: 47
Quality Perf. %: 56.1%
Last Quality Perf.: 2023-02-12
540 Metric: .316
Rating Points: 26
Highest Quarterly Ranking: 7/01/2008

#39 Bantamweight
Last Fight Date: 9/15/2024 [Grachan]
Last Opponent: [NR] Toma Udo
Next Fight: Grachan - Grachan Presents: Helios 2
Next Opponent: [#577 WW] Youta Hayashi
Last Loss Date: 12/11/2020
Last Loss: [#243 FW] Jae Woong Kim
Opponent's Last 5: L L W W NC

Complete Professional MMA Fight History
Fighter rankings represent most recent generated quarterly rating prior to the fight

  Opponent Outcome
W Toma Udo TKO (Punches)
Round 1
  Grachan - Grachan 71
Sunday, September 15th 2024
W Kento Ueda Decision (Unanimous)
Round 2
  Grachan - Grachan 69
Sunday, May 26th 2024
D Yutaka Ueda
#847 Lightweight 		Draw
Round 2
  Grachan - Grachan 63
Sunday, August 6th 2023
W Burenzorig Batmunkh
#497 Welterweight 		TKO (Punches)
Round 1
  Grachan / Brave - Grachan 59 / Brave Fight 27
Sunday, February 12th 2023
L Jae Woong Kim
#248 Lightweight 		TKO (Punches)
Round 2
  ONE Championship: Big Bang 2
Friday, December 11th 2020
L Marat Gafurov
#102 Lightweight 		Decision (Unanimous)
Round 3
  One Championship - For Honor
Friday, May 3rd 2019
W Rafael Nunes
#214 Lightweight 		TKO (Doctor Stoppage)
Round 2
  One Championship - Spirit of a Warrior
Friday, June 29th 2018
W Eric Kelly
#551 Lightweight 		Submission (Rear Naked Choke)
Round 1
  One Championship - Grit & Glory
Saturday, May 12th 2018
L Saygid Guseyn Arslanaliev
#804 Welterweight 		Submission (Armbar)
Round 3
  One Championship - Iron Will
Saturday, March 24th 2018
W Turpal-Ali Astamirov TKO (Punches)
Round 1
  Dacheng Wuyi - Chinese MMA Super League: D...
Sunday, November 12th 2017
W Changzhao Yu
#949 Lightweight 		Decision (Unanimous)
Round 3
  Dacheng Wuyi - Chinese MMA Super League: D...
Saturday, November 11th 2017
W Kyle Rozewski
#1154 Lightweight 		Submission (Rear-Naked Choke)
Round 1
  One Championship - Shanghai
Saturday, September 2nd 2017
W Haotian Wu
#163 Lightweight 		Decision (Unanimous)
Round 3
  Kunlun Fight - Kunlun Fight MMA 13
Thursday, July 6th 2017
W Changzhao Yu
#881 Lightweight 		Submission (Armbar)
Round 2
  Dacheng Wuyi - Chinese MMA Super League Se...
Saturday, June 17th 2017
W Leandro Rodrigues Pontes
#243 Lightweight 		Decision (Unanimous)
Round 3
  Fight Factory Gym - E-1 World Championship
Wednesday, May 31st 2017
W Zhenyue Huang
#667 Lightweight 		Submission (Kneebar)
Round 1
  Dacheng Wuyi - Chinese MMA Super League Fi...
Tuesday, April 11th 2017
L Anton Kuivanen
#162 Lightweight 		Decision (Unanimous)
Round 3
  Cage 38
Saturday, February 18th 2017
W Yuki Ishihara Decision (Unanimous)
Round 2
  Grachan - Grachan 26
Sunday, December 11th 2016
W Yung Joon Jo Submission (Rear-Naked Choke)
Round 1
  Grandslam MMA 5 - Way of the Cage
Thursday, November 3rd 2016
L Eduard Folayang
#284 Lightweight 		Decision (Unanimous)
Round 3
  One Championship 37 - Clash of Heroes
Friday, January 29th 2016
W Yoon Sung Choo
#588 Bantamweight 		Submission (Rear Naked Choke)
Round 1
  Zst - Zst in Yokosuka Vol.2
Saturday, August 1st 2015
W Atsushi Ueda
#648 Lightweight 		Decision (Unanimous)
Round 3
  Zst - Zst 44
Sunday, February 22nd 2015
W Hisato Izawa TKO (Punches)
Round 1
  Zst - Zst in Yokosuka Vol.1
Sunday, June 29th 2014
W Koshi Matsumoto
#454 Welterweight 		Decision (Split)
Round 3
  Heat - Heat 31
Saturday, April 19th 2014
W Shinichi Taira
#720 Welterweight 		TKO (Punches)
Round 1
  Zst - Zst 38
Saturday, November 23rd 2013
W Yutaka Kobayashi KO (Punches)
Round 1
  Zst - Zst in Yokosuka
Saturday, October 12th 2013
W Masayuki Hamagishi
#355 Welterweight 		Decision (Unanimous)
Round 5
  Zst 33 - 10th Anniversary
Friday, November 23rd 2012
L Masayuki Hamagishi
#731 Welterweight 		Decision (Unanimous)
Round 3
  Zst - Zst 31
Saturday, March 17th 2012
W Hiroyuki Ito Submission (Kneebar)
Round 1
  Zst - Zst 30
Wednesday, November 23rd 2011
W Masayuki Hamagishi
#423 Welterweight 		TKO (Doctor Stoppage)
Round 2
  Zst - Zst 29
Sunday, September 11th 2011
W Teppei Hori TKO (Corner Stoppage)
Round 1
  Zst - Battle Hazard 5
Sunday, July 17th 2011
D Hiroki Aoki
#267 Lightweight 		Draw
Round 2
  Pancrase - Passion Tour 10
Wednesday, November 3rd 2010
W Yuki Yamamoto
#520 Welterweight 		Submission (Rear Naked Choke)
Round 1
  Zst - Battle Hazard 4
Saturday, July 3rd 2010
D Shunichi Shimizu
#135 Bantamweight 		Draw
Round 3
  Zst - Zst 24
Sunday, April 18th 2010
W Takafumi Ito
#303 Lightweight 		TKO (Upkick and Punches)
Round 2
  Pancrase - Passion Tour 1
Sunday, February 7th 2010
L Maximo Blanco
#344 Lightweight 		TKO (Punches)
Round 2
  Sengoku - Tenth Battle
Wednesday, September 23rd 2009
L Ronnie Mann
#86 Featherweight 		Decision (Unanimous)
Round 3
  Sengoku - Seventh Battle
Friday, March 20th 2009
W Makoto Toriumi Submission (Armbar)
Round 1
  Zst - Swat! 20
Sunday, September 7th 2008
W Hiroyuki Ota
#490 Lightweight 		KO (Punch)
Round 1
  Zst - Zst 17
Sunday, May 18th 2008
W Takeaki Miyakawa KO (Punch)
Round 1
  Zst 15 - Fifth Anniversary
Friday, November 23rd 2007
W Hironori Takeuchi Submission (Kimura)
Round 1
  Zst - Swat! Rx1
Sunday, September 9th 2007
  Opponent Event Outcome
W Toma Udo   Grachan - Grachan 71
Sunday, September 15th 2024 		TKO (Punches)
Round 1
W Kento Ueda   Grachan - Grachan 69
Sunday, May 26th 2024 		Decision (Unanimous)
Round 2
D Yutaka Ueda
#847 Lightweight 		  Grachan - Grachan 63
Sunday, August 6th 2023 		Draw
Round 2
W Burenzorig Batmunkh
#497 Welterweight 		  Grachan / Brave - Grachan 59 / Brave Fight 27
Sunday, February 12th 2023 		TKO (Punches)
Round 1
L Jae Woong Kim
#248 Lightweight 		  ONE Championship: Big Bang 2
Friday, December 11th 2020 		TKO (Punches)
Round 2
L Marat Gafurov
#102 Lightweight 		  One Championship - For Honor
Friday, May 3rd 2019 		Decision (Unanimous)
Round 3
W Rafael Nunes
#214 Lightweight 		  One Championship - Spirit of a Warrior
Friday, June 29th 2018 		TKO (Doctor Stoppage)
Round 2
W Eric Kelly
#551 Lightweight 		  One Championship - Grit & Glory
Saturday, May 12th 2018 		Submission (Rear Naked Choke)
Round 1
L Saygid Guseyn Arslanaliev
#804 Welterweight 		  One Championship - Iron Will
Saturday, March 24th 2018 		Submission (Armbar)
Round 3
W Turpal-Ali Astamirov   Dacheng Wuyi - Chinese MMA Super League: D...
Sunday, November 12th 2017 		TKO (Punches)
Round 1
W Changzhao Yu
#949 Lightweight 		  Dacheng Wuyi - Chinese MMA Super League: D...
Saturday, November 11th 2017 		Decision (Unanimous)
Round 3
W Kyle Rozewski
#1154 Lightweight 		  One Championship - Shanghai
Saturday, September 2nd 2017 		Submission (Rear-Naked Choke)
Round 1
W Haotian Wu
#163 Lightweight 		  Kunlun Fight - Kunlun Fight MMA 13
Thursday, July 6th 2017 		Decision (Unanimous)
Round 3
W Changzhao Yu
#881 Lightweight 		  Dacheng Wuyi - Chinese MMA Super League Se...
Saturday, June 17th 2017 		Submission (Armbar)
Round 2
W Leandro Rodrigues Pontes
#243 Lightweight 		  Fight Factory Gym - E-1 World Championship
Wednesday, May 31st 2017 		Decision (Unanimous)
Round 3
W Zhenyue Huang
#667 Lightweight 		  Dacheng Wuyi - Chinese MMA Super League Fi...
Tuesday, April 11th 2017 		Submission (Kneebar)
Round 1
L Anton Kuivanen
#162 Lightweight 		  Cage 38
Saturday, February 18th 2017 		Decision (Unanimous)
Round 3
W Yuki Ishihara   Grachan - Grachan 26
Sunday, December 11th 2016 		Decision (Unanimous)
Round 2
W Yung Joon Jo   Grandslam MMA 5 - Way of the Cage
Thursday, November 3rd 2016 		Submission (Rear-Naked Choke)
Round 1
L Eduard Folayang
#284 Lightweight 		  One Championship 37 - Clash of Heroes
Friday, January 29th 2016 		Decision (Unanimous)
Round 3
W Yoon Sung Choo
#588 Bantamweight 		  Zst - Zst in Yokosuka Vol.2
Saturday, August 1st 2015 		Submission (Rear Naked Choke)
Round 1
W Atsushi Ueda
#648 Lightweight 		  Zst - Zst 44
Sunday, February 22nd 2015 		Decision (Unanimous)
Round 3
W Hisato Izawa   Zst - Zst in Yokosuka Vol.1
Sunday, June 29th 2014 		TKO (Punches)
Round 1
W Koshi Matsumoto
#454 Welterweight 		  Heat - Heat 31
Saturday, April 19th 2014 		Decision (Split)
Round 3
W Shinichi Taira
#720 Welterweight 		  Zst - Zst 38
Saturday, November 23rd 2013 		TKO (Punches)
Round 1
W Yutaka Kobayashi   Zst - Zst in Yokosuka
Saturday, October 12th 2013 		KO (Punches)
Round 1
W Masayuki Hamagishi
#355 Welterweight 		  Zst 33 - 10th Anniversary
Friday, November 23rd 2012 		Decision (Unanimous)
Round 5
L Masayuki Hamagishi
#731 Welterweight 		  Zst - Zst 31
Saturday, March 17th 2012 		Decision (Unanimous)
Round 3
W Hiroyuki Ito   Zst - Zst 30
Wednesday, November 23rd 2011 		Submission (Kneebar)
Round 1
W Masayuki Hamagishi
#423 Welterweight 		  Zst - Zst 29
Sunday, September 11th 2011 		TKO (Doctor Stoppage)
Round 2
W Teppei Hori   Zst - Battle Hazard 5
Sunday, July 17th 2011 		TKO (Corner Stoppage)
Round 1
D Hiroki Aoki
#267 Lightweight 		  Pancrase - Passion Tour 10
Wednesday, November 3rd 2010 		Draw
Round 2
W Yuki Yamamoto
#520 Welterweight 		  Zst - Battle Hazard 4
Saturday, July 3rd 2010 		Submission (Rear Naked Choke)
Round 1
D Shunichi Shimizu
#135 Bantamweight 		  Zst - Zst 24
Sunday, April 18th 2010 		Draw
Round 3
W Takafumi Ito
#303 Lightweight 		  Pancrase - Passion Tour 1
Sunday, February 7th 2010 		TKO (Upkick and Punches)
Round 2
L Maximo Blanco
#344 Lightweight 		  Sengoku - Tenth Battle
Wednesday, September 23rd 2009 		TKO (Punches)
Round 2
L Ronnie Mann
#86 Featherweight 		  Sengoku - Seventh Battle
Friday, March 20th 2009 		Decision (Unanimous)
Round 3
W Makoto Toriumi   Zst - Swat! 20
Sunday, September 7th 2008 		Submission (Armbar)
Round 1
W Hiroyuki Ota
#490 Lightweight 		  Zst - Zst 17
Sunday, May 18th 2008 		KO (Punch)
Round 1
W Takeaki Miyakawa   Zst 15 - Fifth Anniversary
Friday, November 23rd 2007 		KO (Punch)
Round 1
W Hironori Takeuchi   Zst - Swat! Rx1
Sunday, September 9th 2007 		Submission (Kimura)
Round 1

Quarterly Generated Historical Rankings
Rating bar represents the fighter's standing relative to the top of the division at the time

Date ↑ ↓ Rank Record Points
10/01/2025 30 #510 Welterweight 30-8-3
27
07/01/2025 18 #480 Welterweight 30-8-3
29
04/01/2025 6 #462 Welterweight 30-8-3
29
01/01/2025 1 #468 Welterweight 30-8-3
29
10/01/2024 6 #467 Welterweight 30-8-3
29
07/01/2024 NR #473 Welterweight 29-8-3
29
04/01/2024 16 #416 Lightweight 28-8-3
36
01/01/2024 28 #400 Lightweight 28-8-3
36
10/01/2023 NR #428 Lightweight 28-8-3
34
07/01/2023 1 #328 Welterweight 28-8-2
36
04/01/2023 NR #327 Welterweight 28-8-2
36
01/01/2022 17 #452 Lightweight 27-8-2
30
10/01/2021 55 #435 Lightweight 27-8-2
30
07/01/2021 62 #380 Lightweight 27-8-2
30
04/01/2021 28 #318 Lightweight 27-8-2
34
01/01/2021 NR #346 Lightweight 27-8-2
34
07/01/2020 27 #231 Lightweight 27-7-2
51
04/01/2020   #204 Lightweight 27-7-2
56
01/01/2020 1 #204 Lightweight 27-7-2
56
10/01/2019 4 #205 Lightweight 27-7-2
58
07/01/2019 64 #209 Lightweight 27-7-2
59
04/01/2019 5 #145 Lightweight 27-6-2
74
01/01/2019 11 #150 Lightweight 27-6-2
74
10/01/2018 1 #139 Lightweight 27-6-2
74
07/01/2018 NR #140 Lightweight 27-6-2
74
04/01/2018 NR #290 Welterweight 25-6-2
42
01/01/2018 3 #139 Lightweight 25-5-2
75
10/01/2017 77 #136 Lightweight 23-5-2
75
07/01/2017 213 #213 Lightweight 21-5-2
54
04/01/2017 68 #426 Lightweight 18-5-2
33
01/01/2017 NR #358 Lightweight 18-4-2
37
10/01/2016 19 #432 Welterweight 16-4-2
30
07/01/2016 23 #413 Welterweight 16-4-2
30
04/01/2016 NR #436 Welterweight 16-4-2
30
01/01/2016 3 #204 Lightweight 16-3-2
54
10/01/2015 9 #201 Lightweight 16-3-2
54
07/01/2015 65 #192 Lightweight 15-3-2
56
04/01/2015 33 #257 Lightweight 15-3-2
45
01/01/2015 11 #290 Lightweight 14-3-2
40
10/01/2014 4 #279 Lightweight 14-3-2
41
07/01/2014 20 #275 Lightweight 14-3-2
41
04/01/2014 5 #295 Lightweight 12-3-2
38
01/01/2014 NR #290 Lightweight 12-3-2
38
10/01/2013 13 #461 Welterweight 10-3-2
27
07/01/2013 85 #448 Welterweight 10-3-2
27
04/01/2013 2 #363 Welterweight 10-3-2
31
01/01/2013 195 #361 Welterweight 10-3-2
31
10/01/2012 19 #556 Welterweight 9-3-2
23
07/01/2012 79 #537 Welterweight 9-3-2
23
04/01/2012 185 #458 Welterweight 9-3-2
26
01/01/2012 21 #273 Welterweight 9-2-2
35
10/01/2011 NR #252 Welterweight 8-2-2
36
07/01/2011 2 #305 Lightweight 6-2-2
33
04/01/2011 1 #303 Lightweight 6-2-2
33
01/01/2011 29 #302 Lightweight 6-2-2
33
10/01/2010 93 #273 Lightweight 6-2-1
36
07/01/2010 20 #366 Lightweight 5-2-1
29
04/01/2010 389 #346 Lightweight 5-2-0
30
01/01/2010 19 #735 Lightweight 4-2-0
18
10/01/2009 NR #716 Lightweight 4-2-0
18
07/01/2009 33 #300 Featherweight 4-1-0
19
04/01/2009 NR #267 Featherweight 4-1-0
19
01/01/2009 67 #438 Lightweight 4-0-0
22
10/01/2008 NR #371 Lightweight 4-0-0
24
07/01/2008 29 #39 Bantamweight 3-0-0
30
04/01/2008 2 #68 Bantamweight 2-0-0
21
01/01/2008 NR #66 Bantamweight 2-0-0
21
10/01/2007 NR #261 Featherweight 1-0-0
16


A fighter's rank (US) state is assigned based on the state that the fighter most frequently fought in professionally, within the past three years. If there is a tie, the most recent state is used. The Win-Loss-Draw record for the fighter in the "Big Leagues". The Big Leagues refer to the top organizations based on a statistical analysis we performed. Some organizations were counted as one, due to mergers, etc. A quality performance is a fight in which the fighter fought an acceptable opponent, and substantiated their current rating (at the time) based on the outcome. At it's most basic level, one can equate "combat age" to "dog years" in that it will mirror the basic human lifecycle. With this computation, we expect fighters to hit their respective "peak" in the years that your typical adult "peaks" in life, somewhere between 25 and 40. We will expect most fighters to start their descent at some point in their 40s and be far removed from their peak by 60. This is an experimental metric that attempts to reflect a fighter's recent opposition quality. The metric goes back 1,080 days, and looks at all the fighter's opponents' W-L-D records within a window of 540 days before, and 540 days after their respective bout(s) with the fighter. All of the records are added up and the cumulative win percentage is presented by this metric in a "strength of schedule" format. These ranking sets have been generated by a recent version of the software, using recent data and will not match previously published issues of the rankings, especially since a majority of these generated sets are for dates much earlier than the site’s inception.

Current MMA Rankings

  • Pound for Pound
  • Division Point Dominance
  • Heavyweight+
  • Light Heavyweight
  • Middleweight
  • Welterweight
  • Lightweight
  • Featherweight
  • Bantamweight
  • Flyweight
  • Strawweight
  • Women’s Pound for Pound
  • Women’s Division Point Dominance
  • Women’s Featherweight+
  • Women’s Bantamweight
  • Women’s Flyweight
  • Women’s Strawweight
  • Women’s Atomweight
  • Unknown Division

jalwa game

jalwa game

91club

ok win

Advertise With Us

Support Fightmatrix.com and reach thousands of MMA fans by advertising with us! Click for more details.

Features

  • Fighter Search
  • All-Time MMA Rankings
  • Historical MMA Rankings
  • Weekly Ranking Summary
  • Upcoming MMA Events
  • Lineal Championship Histories
  • FightMatrix MMA Awards
  • Links and Mentions
  • Past Events

Daman Game Download

Recent Posts

  • How to Speed Up Design Workflow Using CapCut PC AI Image Generator
  • Hard Rock Bet Officially Launches Online Casino in Michigan After MGCB Approval
  • Fight Odds Breakdown: How Missouri Combat Sports Fans Can Bet Smarter When Sportsbooks Launch
  • Are MMA Rankings Relatable? (Spoiler: No)
  • How Boxing’s Classic Techniques Became MMA’s Modern Edge

daman game

BDG win

bdg win

55 club login

daman game

Raja Luck Game

Tiranga Game

©2025 Fight Matrix    Privacy Policy    Terms and Conditions

Fast Withdrawal Boxing Sites

[] vs []
 
Rating Pre Post Pre Post
ELO K-170
ELO Modified
Glicko-1