Wins
423
Indexed tournament wins
Player record
Sean O'Neill
Losses
134
Indexed tournament losses
Matches
557
Decisive results
Win rate
75.9%
Across indexed matches
Peak rating
2,667
Highest rating in the available history.
Biggest upset
Mark Hazinski
2001 Nashville Open · May 13, 2001 · +137 rating
Open →Biggest loss
Lyashchuk, Rostyslav
2004 N. American Teams Open TT · Nov 28, 2004 · -474 rating
Open →Most frequent opponent
Cheng, Yinghua
14 matches
Open →Rating trajectory
Published rating movement across recorded events.
Tournament history
79 tournament appearances · synced Aug 9, 2026, 4:21 AM
| Date | Tournament | Rating in | Rating after | Points changed | Record |
|---|---|---|---|---|---|
| Dec 1, 2002 | Stiga N.A. Teams ChampionshipsTournament · View matches | 2,399 | 2,429 | +30 | 11W / 5L |
| Nov 17, 2002 | Potomac OpenTournament · View matches | 2,499 | 2,399 | -100+0 / -100 | 1W / 2L |
| Sep 22, 2002 | Matthew Murad Mem OpenTournament · View matches | 2,498 | 2,499 | +1+4 / -3 | 1W / 2L |
| Sep 14, 2002 | Stiga Cary Fall OpenTournament · View matches | 2,495 | 2,498 | +3+3 / 0 | 10W / 0L |
| May 19, 2002 | Western Open on the 2002 StigaTournament · View matches | 2,505 | 2,495 | -10+10 / -20 | 4W / 3L |
| Mar 24, 2002 | Buckeye OpenTournament · View matches | 2,505 | 2,505 | 0 | 6W / 3L |
| Mar 17, 2002 | Boston TTC March OpenTournament · View matches | 2,500 | 2,505 | +5 | 4W / 0L |
| Dec 23, 2001 | 2001 USATT NationalsTournament · View matches | 2,500 | 2,500 | 0+4 / -4 | 7W / 1L |
| Dec 19, 2001 | 2002 USATT National Team TrialTournament · View matches | 2,488 | 2,500 | +12+27 / -15 | 4W / 5L |
| Nov 25, 2001 | 2001 Stiga No. American TeamsTournament · View matches | 2,451 | 2,488 | +37+54 / -17 | 11W / 2L |
| Nov 18, 2001 | Potomac OpenTournament · View matches | 2,457 | 2,451 | -6+2 / -8 | 4W / 1L |
| Sep 22, 2001 | Mid-Atlantic Top 12 InvitationTournament · View matches | 2,457 | 2,457 | 0+0 / 0 | 7W / 0L |
| Sep 2, 2001 | Western Open on the 2001 NA ToTournament · View matches | 2,466 | 2,454 | -12 | 5W / 3L |
| Aug 18, 2001 | Decatur OpenTournament · View matches | 2,458 | 2,466 | +8+8 / 0 | 7W / 0L |
| Jul 22, 2001 | Eastern Open on the 2001 NA ToTournament · View matches | 2,470 | 2,458 | -12+8 / -20 | 2W / 4L |
| Jul 8, 2001 | 2001 US Open 3Tournament · View matches | 2,500 | 2,470 | -30+10 / -40 | 5W / 2L |
| Jun 17, 2001 | Matthew Murad Memorial Open - Tournament · View matches | 2,482 | 2,500 | +18 | 4W / 3L |
| May 20, 2001 | Lone Star Open on the 2001 NA Tournament · View matches | 2,503 | 2,482 | -21 | 6W / 2L |
| May 13, 2001 | 2001 Nashville OpenTournament · View matches | 2,489 | 2,503 | +14 | 6W / 3L |
| Dec 17, 2000 | 2000 USATT National ChampionshipTournament · View matches | 2,485 | 2,489 | +4 | 6W / 1L |