Wins
14
Indexed tournament wins
Player record
Koyama, Jaelyn
Losses
62
Indexed tournament losses
Matches
76
Decisive results
Win rate
18.4%
Across indexed matches
Peak rating
1,353
Highest rating in the available history.
Biggest upset
Ashish Jha
2012 Berkeley Open on JOOLA North America Tour · Sep 23, 2012 · +669 rating
Open →Biggest loss
Shen, Kevin
ICC CA State Open · May 2, 2010 · -113 rating
Open →Most frequent opponent
Zili Wang
3 matches
Open →Rating trajectory
Published rating movement across recorded events.
Tournament history
15 tournament appearances · synced Aug 8, 2026, 2:19 AM
| Date | Tournament | Rating in | Rating after | Points changed | Record |
|---|---|---|---|---|---|
| Dec 8, 2013 | ICC CA State OpenTournament · View matches | 1,353 | 1,337 | -16+0 / -16 | 0W / 5L |
| Jul 6, 2013 | US OpenTournament · View matches | 1,088 | 1,353 | +265 | 4W / 7L |
| May 19, 2013 | ICC CA State OpenTournament · View matches | 1,088 | 1,088 | 0+0 / 0 | 0W / 6L |
| Feb 17, 2013 | ICC CA State OpenTournament · View matches | 1,038 | 1,088 | +50+50 / 0 | 1W / 4L |
| Dec 9, 2012 | ICC California State OpenTournament · View matches | 1,037 | 1,038 | +1+1 / 0 | 1W / 4L |
| Oct 28, 2012 | Concord Cup Youth Open TournamentTournament · View matches | 1,043 | 1,037 | -6+0 / -6 | 1W / 4L |
| Sep 23, 2012 | 2012 Berkeley Open on JOOLA North America TourTournament · View matches · USATT readjusted 686 → 992 | 686 | 1,043 | +51+60 / -9 | 3W / 3L |
| Sep 16, 2012 | JUIC International Jr. & Cadet ChampionshipTournament · View matches · USATT readjusted 592 → 642 | 592 | 686 | +44+45 / -1 | 1W / 4L |
| May 27, 2012 | ICC California State OpenTournament · View matches | 543 | 592 | +49+50 / -1 | 1W / 2L |
| Mar 18, 2012 | ICC California State OpenTournament · View matches | 549 | 543 | -6+0 / -6 | 0W / 5L |
| Feb 19, 2012 | 2012 Western Open on JOOLA North America TourTournament · View matches | 519 | 549 | +30 | 1W / 5L |
| Dec 5, 2010 | ICC CA State OpenTournament · View matches · USATT readjusted 419 → 469 | 419 | 519 | +50+50 / 0 | 1W / 1L |
| May 2, 2010 | ICC CA State OpenTournament · View matches | 421 | 419 | -2 | 0W / 6L |
| Feb 28, 2010 | ICC CA State OpenTournament · View matches | 437 | 421 | -16+0 / -16 | 0W / 2L |
| Dec 6, 2009 | ICC California State OpenTournament · View matches · Initial rating 437 | Unrated | 437 | — | 0W / 4L |
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