For his professional baseball career, O’Malley has slapped 16 baseballs out of the park while driving in 145 runs. Over the course of his time in the league, he stepped up to bat 1,499 times and has reached base with a hit 337 times. His career slugging percentage is .072 and he has totaled 456 bases. He has gone down on strikes 171 times and earned a walk on 144 occasions, which has contributed to a .326 on-base percentage. O’Malley has compiled an average at the plate of .253 for his career in addition to 131 scored runs and an OPS of .397.
O’Malley has compiled 43 bases in total with 27 base knocks in 121 at-bats. He has accounted for an on-base percentage of .286 in addition to 11 walks and 20 K’s. Over the course of this season, Tom O’Malley has knocked in 14 runs and has accumulated a slugging percentage of .355. He has notched 14 runs so far this season and has hit 3 balls out of the park. He has accounted for a batting average of .223 while holding an OPS of .641.
| Year | Team | BA | HR | H | BB | R | RBI | OBP | PA | AB | OPS | OPS+ | 2B | 3B | G | SLG | SB | CS | TB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Career | .256 | 13 | 310 | 133 | 117 | 131 | .329 | 1,366 | 1,213 | .670 | 87 | 54 | 5 | 466 | .340 | 2 | 8 | 413 | 151 | |
| 1990 | NYM | .223 | 3 | 27 | 11 | 14 | 14 | .286 | 133 | 121 | .641 | 76 | 7 | 0 | 82 | .355 | 0 | 0 | 43 | 20 |
| 1989 | NYM | .545 | 0 | 6 | 0 | 2 | 8 | .545 | 11 | 11 | 1.273 | 270 | 2 | 0 | 9 | .727 | 0 | 0 | 8 | 2 |
| 1988 | MON | .259 | 0 | 7 | 3 | 3 | 2 | .323 | 31 | 27 | .582 | 67 | 0 | 0 | 14 | .259 | 0 | 0 | 7 | 4 |
| 1987 | TEX | .274 | 1 | 32 | 15 | 10 | 12 | .351 | 134 | 117 | .718 | 92 | 8 | 0 | 45 | .368 | 0 | 0 | 43 | 9 |
| 1986 | BAL | .254 | 1 | 46 | 17 | 19 | 18 | .317 | 200 | 181 | .637 | 76 | 9 | 0 | 56 | .320 | 0 | 1 | 58 | 21 |
| 1985 | BAL | .071 | 1 | 1 | 0 | 1 | 2 | .071 | 14 | 14 | .357 | -7 | 0 | 0 | 8 | .286 | 0 | 0 | 4 | 2 |
| 1984 | TOT | .122 | 0 | 5 | 2 | 2 | 3 | .163 | 43 | 41 | .285 | -19 | 0 | 0 | 25 | .122 | 0 | 0 | 5 | 7 |
| 1984 | SFG | .120 | 0 | 3 | 2 | 2 | 0 | .185 | 27 | 25 | .305 | -11 | 0 | 0 | 13 | .120 | 0 | 0 | 3 | 2 |
| 1984 | CHW | .125 | 0 | 2 | 0 | 0 | 3 | .125 | 16 | 16 | .250 | -32 | 0 | 0 | 12 | .125 | 0 | 0 | 2 | 5 |
| 1983 | SFG | .259 | 5 | 106 | 52 | 40 | 45 | .345 | 473 | 410 | .684 | 94 | 16 | 1 | 135 | .339 | 2 | 4 | 139 | 47 |
| 1982 | SFG | .275 | 2 | 80 | 33 | 26 | 27 | .350 | 327 | 291 | .714 | 102 | 12 | 4 | 92 | .364 | 0 | 3 | 106 | 39 |
