Billy O'Brien
Baseball Reference Page
| Team | Year | Pos | AB | R | H | HR | RBI | AVG | RC | Def RP | Tot | RPG |
| KCU | 1884 | 3B | 17 | 2 | 4 | 0 | | 0.235 | -0.4 | -0.1 | -0.6 | -0.132 |
| SPU | 1884 | 3B | 30 | 1 | 7 | 0 | | 0.233 | 0.1 | 1.3 | 1.4 | 0.184 |
| WS8 | 1887 | 1B | 453 | 71 | 126 | 19 | 73 | 0.278 | 35.8 | -14.8 | 21.1 | 0.193 |
| WS8 | 1888 | 1B | 528 | 42 | 119 | 9 | 66 | 0.225 | 12.4 | -11.9 | 0.5 | 0.004 |
| WS8 | 1889 | 1B | 8 | 1 | 0 | 0 | 0 | 0.000 | -1.2 | -0.7 | -1.9 | -0.711 |
| BR4 | 1890 | 1B | 388 | 47 | 108 | 4 | 67 | 0.278 | 28.0 | -4.2 | 23.8 | 0.255 |