| 2021 US National Table Tennis Championships
 David I. Rubin
 Wins
| Opponent - Click name for results | USATT # | Rating | Format | Event - Click event for draws and results | Scores | 
|---|
 | Efosa Osayimwen | 219739 | 1307 | RR | Men's 40+ Singles | 3,4,3 |  | Anthony Cavazos | 56980 | 1785 | RR | Men's 50+ Singles | 9,5,6 |  | Michael Levin | 214419 | 2009 | RR | U2550 | 6,10,-5,-3,8 |  | Steven Chen | 90786 | 1894 | RR | U2200 | 5,-3,7,-7,9 |  | Pratyush Mohanty | 1132007 | 1147 | RR | U2200 | -12,12,8,4 |  | Cliff Lin | 220552 | 1810 | RR | U2000 | 8,-9,8,8 |  | Michele Carbone | 85894 | 1588 | RR | U2000 | 6,6,4 |  | Justin Bookey | 69850 | 1464 | RR | U2000 | -8,7,7,7 |  | Kamran Azimzadeh | 3611 | 1448 | RR | Men's 60+ Singles | 7,9,3 |  | Kelvin Lee | 216968 | 1110 | RR | Men's 60+ Singles | 2,6,6 | 
 
  Losses| Opponent - Click name for results | USATT # | Rating | Format | Event - Click event for draws and results | Scores | 
|---|
 | Tuan Dai Le Md | 47064 | 2266 | RR | Men's 40+ Singles | 4,4,7 |  | John P. Ochsner | 5004 | 2016 | RR | Men's 40+ Singles | 2,5,-9,6 |  | James Therriault | 10533 | 2137 | SE | Men's 50+ Singles-Quarters | 5,6,-6,8 |  | John Alto | 30755 | 2313 | RR | U2550 | -6,2,4,4 |  | Dan Seemiller Jr | 27825 | 2228 | RR | U2550 | 6,6,6 |  | Bin Hai Chu | 13020 | 2181 | RR | U2200 | 4,4,3 |  | Todd Klinger | 212177 | 1824 | SE | U2000-Prelims | -8,11,10,8 |  | Kyle Drake | 5458 | 2025 | RR | Men's 60+ Singles | 6,9,10 | 
 |