O’Brien has recorded a free base 667 times while fanning on 584 tries. His on-base percentage sits at .336 and he is the owner of a career OPS of .358. He has a total of 684 runs and notched 763 runs batted in. He has hit it out of the park 176 times, with 2,306 bases in total and also a .022 slugging %. During the 5,647 official at-bats in his professional career, O’Brien is sitting with a batting average of .261 with 1,475 base hits.
This season, O’Brien is sitting with 30 runs, recorded 27 runs batted in and has earned 7 home runs. He has walked 26 times and sports an on-base percentage of .335. O’Brien has accumulated 54 hits in 210 at-bats and has a batting average of .257. He has gone down on strikes 21 times while accounting for 82 bases in total. He has an OPS of 0.725 in addition to a slugging percentage of .390.
| Year | Team | BA | HR | H | BB | R | RBI | OBP | PA | AB | OPS | OPS+ | 2B | 3B | G | SLG | SB | CS | TB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Career | .261 | 169 | 1,421 | 641 | 654 | 736 | .336 | 6,168 | 5,437 | .745 | 104 | 254 | 21 | 1,567 | .409 | 24 | 34 | 2,224 | 563 | |
| 1993 | SEA | .257 | 7 | 54 | 26 | 30 | 27 | .335 | 239 | 210 | .725 | 94 | 7 | 0 | 72 | .390 | 0 | 0 | 82 | 21 |
| 1992 | SEA | .222 | 14 | 88 | 40 | 40 | 52 | .289 | 444 | 396 | .660 | 84 | 15 | 1 | 134 | .371 | 2 | 1 | 147 | 27 |
| 1991 | SEA | .248 | 17 | 139 | 44 | 58 | 88 | .300 | 617 | 560 | .701 | 93 | 29 | 3 | 152 | .402 | 0 | 1 | 225 | 61 |
| 1990 | SEA | .224 | 5 | 82 | 44 | 32 | 27 | .308 | 417 | 366 | .622 | 75 | 18 | 0 | 108 | .314 | 0 | 0 | 115 | 33 |
| 1989 | CLE | .260 | 12 | 144 | 83 | 75 | 55 | .356 | 646 | 554 | .727 | 105 | 24 | 1 | 155 | .372 | 3 | 1 | 206 | 48 |
| 1988 | TEX | .272 | 16 | 149 | 72 | 57 | 71 | .352 | 628 | 547 | .760 | 111 | 24 | 1 | 156 | .408 | 1 | 4 | 223 | 73 |
| 1987 | TEX | .286 | 23 | 163 | 59 | 84 | 88 | .348 | 638 | 569 | .805 | 112 | 26 | 1 | 159 | .457 | 0 | 4 | 260 | 61 |
| 1986 | TEX | .290 | 23 | 160 | 87 | 86 | 90 | .385 | 641 | 551 | .854 | 130 | 23 | 3 | 156 | .468 | 4 | 4 | 258 | 66 |
| 1985 | TEX | .267 | 22 | 153 | 69 | 69 | 92 | .342 | 655 | 573 | .794 | 115 | 34 | 3 | 159 | .452 | 5 | 10 | 259 | 53 |
| 1984 | TEX | .287 | 18 | 149 | 53 | 57 | 80 | .348 | 581 | 520 | .796 | 117 | 26 | 2 | 142 | .448 | 3 | 5 | 233 | 50 |
| 1983 | TEX | .237 | 8 | 124 | 58 | 53 | 53 | .313 | 588 | 524 | .660 | 85 | 24 | 5 | 154 | .347 | 5 | 4 | 182 | 62 |
| 1982 | TEX | .239 | 4 | 16 | 6 | 13 | 13 | .297 | 74 | 67 | .805 | 123 | 4 | 1 | 20 | .507 | 1 | 0 | 34 | 8 |
