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 |
|---|---|---|---|---|---|
| Jun 1, 2002 | Rose City OpenTournament · View matches | 1,645 | 1,585 | -60+0 / -60 | 3W / 3L |
| Nov 4, 2001 | Stiga Pacific Rim OpenTournament · View matches | 1,672 | 1,645 | -27 | 7W / 7L |
| Oct 21, 2001 | Tri-City open Fall Double RRTournament · View matches · USATT readjusted 1,563 → 1,626 | 1,563 | 1,672 | +46+63 / -17 | 12W / 6L |
| Aug 11, 2001 | Summer Time Fun OpenTournament · View matches | 1,587 | 1,563 | -24+0 / -24 | 0W / 4L |
| Jun 10, 2001 | 2001 Seattle OpenTournament · View matches | 1,630 | 1,587 | -43 | 7W / 7L |
| May 6, 2001 | 2001 WA State Open, Closed, TrTournament · View matches | 1,668 | 1,630 | -38 | 3W / 3L |
| Dec 9, 2000 | Portland Double RR OpenTournament · View matches | 1,670 | 1,668 | -2+4 / -6 | 4W / 3L |
| Nov 5, 2000 | Stiga Pacific Rim OpenTournament · View matches | 1,670 | 1,660 | -10+12 / -22 | 4W / 4L |
| Oct 22, 2000 | Tri-City Open Fall Double RRTournament · View matches | 1,661 | 1,686 | +25 | 11W / 7L |
| Jun 17, 2000 | Three-Man Team OpenTournament · View matches | 1,719 | 1,661 | -58+0 / -58 | 0W / 6L |
| Apr 16, 2000 | Tri-City Open Spring Double RRTournament · View matches | 1,758 | 1,719 | -39 | 10W / 6L |
| Mar 25, 2000 | Portland Double RR OpenTournament · View matches | 1,757 | 1,758 | +1+29 / -28 | 5W / 5L |
| Nov 7, 1999 | Stiga Pacific Rim OpenTournament · View matches | 1,717 | 1,757 | +40 | 6W / 5L |
| Aug 7, 1999 | Portland Summer Double RR OpenTournament · View matches | 1,726 | 1,717 | -9+11 / -20 | 7W / 2L |
| Jun 19, 1999 | 3-Man Team OpenTournament · View matches | 1,715 | 1,726 | +11+13 / -2 | 7W / 1L |
| Jun 13, 1999 | 1999 Seattle OpenTournament · View matches | 1,781 | 1,715 | -66 | 6W / 6L |
| Apr 24, 1999 | 1999 Overseas Chinese OpenTournament · View matches | 1,807 | 1,781 | -26+0 / -26 | 0W / 3L |
| Apr 18, 1999 | Tri-City Spring RRTournament · View matches | 1,856 | 1,807 | -49 | 8W / 7L |
| Dec 20, 1998 | 1998 USATT NationalsTournament · View matches · USATT readjusted 1,658 → 1,864 | 1,658 | 1,856 | -8+65 / -73 | 15W / 10L |
| Dec 5, 1998 | Portland Warm-Up Double RRTournament · View matches | 1,656 | 1,658 | +2+9 / -7 | 4W / 3L |