Wins
433
Indexed tournament wins
Player record
Mason, William
Losses
419
Indexed tournament losses
Matches
852
Decisive results
Win rate
50.8%
Across indexed matches
Peak rating
1,856
Highest rating in the available history.
Biggest upset
Ping, Ken
Tri-City open Fall Double RR · Oct 21, 2001 · +368 rating
Open →Biggest loss
Rob Clark
2003 Bellevue Open · Mar 30, 2003 · -658 rating
Open →Most frequent opponent
Mark Kobernick
21 matches
Open →Rating trajectory
Published rating movement across recorded events.
Tournament history
75 tournament appearances · synced Aug 8, 2026, 2:17 AM
| Date | Tournament | Rating in | Rating after | Points changed | Record |
|---|---|---|---|---|---|
| Nov 8, 1998 | 1998 Pacific Rim OpenTournament · View matches | 1,655 | 1,656 | +1+11 / -10 | 3W / 7L |
| Oct 18, 1998 | Tri-Cities Fall Open RRTournament · View matches | 1,611 | 1,655 | +44 | 12W / 5L |
| Sep 12, 1998 | Portland Late Summer Double RRTournament · View matches | 1,634 | 1,611 | -23+13 / -36 | 5W / 3L |
| Jul 18, 1998 | Portland Open July 98 Double RTournament · View matches | 1,654 | 1,634 | -20+15 / -35 | 5W / 4L |
| Jun 6, 1998 | Portland Double RR, U.S. Open Tournament · View matches | 1,672 | 1,654 | -18+6 / -24 | 4W / 4L |
| Apr 4, 1998 | '98 Overseas Chinese OpenTournament · View matches | 1,699 | 1,672 | -27+0 / -27 | 1W / 7L |
| Mar 29, 1998 | Portland TT March BashTournament · View matches | 1,724 | 1,699 | -25 | 7W / 7L |
| Feb 28, 1998 | Two-Man Team RRTournament · View matches | 1,723 | 1,724 | +1+3 / -2 | 1W / 2L |
| Jan 24, 1998 | Portland Giant RRTournament · View matches | 1,755 | 1,723 | -32 | 6W / 4L |
| Dec 21, 1997 | US NationalsTournament · View matches · USATT readjusted 1,693 → 1,741 | 1,693 | 1,755 | +14+82 / -68 | 9W / 8L |
| Dec 6, 1997 | Portland TT Double RRTournament · View matches | 1,725 | 1,693 | -32+0 / -32 | 7W / 3L |
| Nov 16, 1997 | Mini-Pac Rim Oregon ChampionshTournament · View matches | 1,716 | 1,725 | +9+30 / -21 | 7W / 7L |
| Oct 19, 1997 | Tri-Cities Open Fall RRTournament · View matches | 1,675 | 1,716 | +41+69 / -28 | 11W / 6L |
| Oct 12, 1997 | Portland Fall OpenTournament · View matches | 1,682 | 1,675 | -7 | 8W / 7L |
| Jul 26, 1997 | Washington State OpenTournament · View matches | 1,701 | 1,682 | -19+4 / -23 | 3W / 4L |
| Jul 6, 1997 | U.S. OpenTournament · View matches | 1,612 | 1,701 | +89 | 9W / 12L |
| Jun 29, 1997 | Rose City OpenTournament · View matches | 1,692 | 1,612 | -80 | 7W / 7L |
| Jun 8, 1997 | Meiklejohn Nat'l Seniors TTTTournament · View matches | 1,703 | 1,692 | -11+0 / -11 | 0W / 7L |
| May 25, 1997 | 23rd Annual Golden State OpenTournament · View matches | 1,709 | 1,703 | -6+14 / -20 | 2W / 7L |
| May 4, 1997 | Seattle OpenTournament · View matches | 1,720 | 1,709 | -11 | 3W / 7L |