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| "O" Batting Register | |
| Pitching Register | Batting Glossary |
| Player | From-To | G | AB | R | H | 2B | 3B | HR | RBI | SB | CS | BB | SO | AVG | OBP | SLG | OPS | OWS |
| Rebel Oakes | 1909-1919 | 963 | 3242 | 456 | 934 | 88 | 39 | 3 | 248 | 179 | 101 | 262 | 317 | .288 | .344 | .342 | .686 | 68.4 |
| Frank Oberlin | 1907-1907 | 5 | 1 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | 1 | .000 | .000 | .000 | .000 | 0.0 |
| Buck O'Brien | 1911-1916 | 72 | 73 | 1 | 6 | 0 | 0 | 0 | 1 | 1 | 0 | 1 | 30 | .082 | .095 | .082 | .177 | 0.0 |
| Jack O'Brien | 1901-1905 | 274 | 721 | 103 | 185 | 25 | 9 | 5 | 109 | 31 | 18 | 56 | 32 | .257 | .318 | .337 | .655 | 9.2 |
| Pete O'Brien | 1901-1905 | 41 | 118 | 10 | 24 | 4 | 1 | 0 | 12 | 0 | 1 | 4 | 16 | .203 | .222 | .254 | .476 | 0.4 |
| Jimmy O'Connell | 1923-1929 | 694 | 1766 | 266 | 486 | 79 | 37 | 8 | 224 | 98 | 54 | 201 | 109 | .275 | .354 | .375 | .729 | 30.1 |
| Jack O'Connor | 1888-1903 | 134 | 406 | 42 | 77 | 5 | 1 | 8 | 48 | 2 | 2 | 31 | 25 | .190 | .245 | .266 | .511 | 0.6 |
| Lefty O'Doul | 1922-1929 | 964 | 3566 | 469 | 1129 | 187 | 18 | 55 | 525 | 7 | 2 | 258 | 152 | .317 | .361 | .425 | .787 | 90.1 |
| Fred Odwell | 1904-1908 | 398 | 1337 | 219 | 373 | 70 | 27 | 9 | 145 | 130 | 33 | 78 | 176 | .279 | .320 | .392 | .712 | 28.3 |
| Bob O'Farrell | 1919-1929 | 786 | 2711 | 328 | 744 | 93 | 31 | 8 | 328 | 24 | 33 | 256 | 49 | .274 | .335 | .340 | .676 | 35.7 |
| Curly Ogden | 1925-1929 | 162 | 51 | 5 | 14 | 5 | 0 | 0 | 5 | 0 | 0 | 2 | 5 | .275 | .302 | .373 | .674 | 0.8 |
| Jack Ogden | 1923-1929 | 60 | 11 | 0 | 2 | 0 | 0 | 0 | 2 | 0 | 0 | 0 | 3 | .182 | .182 | .182 | .364 | 0.3 |
| Bill O'Hara | 1910-1910 | 7 | 29 | 7 | 7 | 3 | 1 | 1 | 2 | 2 | 0 | 3 | 2 | .241 | .303 | .517 | .820 | 1.5 |
| Rube Oldring | 1905-1922 | 1732 | 6021 | 811 | 1597 | 240 | 115 | 45 | 687 | 521 | 132 | 355 | 417 | .265 | .305 | .366 | .671 | 117.8 |
| Hank Olmsted | 1907-1908 | 11 | 20 | 2 | 3 | 2 | 1 | 0 | 2 | 0 | 0 | 1 | 13 | .150 | .190 | .350 | .540 | 0.3 |
| Ole Olsen | 1922-1927 | 76 | 99 | 8 | 24 | 3 | 0 | 1 | 14 | 0 | 1 | 4 | 14 | .242 | .269 | .303 | .572 | 0.5 |
| Ivy Olson | 1911-1919 | 592 | 1903 | 221 | 501 | 66 | 25 | 6 | 193 | 88 | 50 | 125 | 324 | .263 | .312 | .334 | .646 | 32.2 |
| Alejandro Oms | 1921-1929 | 1014 | 3133 | 527 | 970 | 140 | 79 | 36 | 484 | 153 | 94 | 304 | 224 | .310 | .372 | .439 | .811 | 78.8 |
| Bill O'Neill | 1905-1913 | 983 | 3320 | 428 | 937 | 87 | 19 | 15 | 320 | 130 | 24 | 270 | 199 | .282 | .340 | .333 | .673 | 74.1 |
| Jack O'Neill | 1902-1902 | 12 | 38 | 2 | 8 | 1 | 0 | 0 | 1 | 0 | 0 | 1 | 2 | .211 | .250 | .237 | .487 | 0.0 |
| Jim O'Neill | 1920-1925 | 225 | 587 | 74 | 166 | 23 | 13 | 1 | 61 | 20 | 7 | 29 | 62 | .283 | .319 | .371 | .690 | 6.4 |
| Mike O'Neill | 1901-1905 | 118 | 279 | 29 | 74 | 2 | 1 | 0 | 19 | 8 | 4 | 2 | 103 | .265 | .268 | .280 | .547 | 2.0 |
| Steve O'Neill | 1912-1914 | 48 | 181 | 27 | 55 | 8 | 2 | 1 | 27 | 0 | 0 | 19 | 9 | .304 | .380 | .387 | .767 | 5.7 |
| Mickey O'Neil | 1919-1920 | 134 | 456 | 34 | 102 | 8 | 12 | 0 | 49 | 21 | 18 | 18 | 41 | .224 | .254 | .294 | .547 | 0.0 |
| Eddie Onslow | 1919-1923 | 441 | 1547 | 210 | 478 | 33 | 7 | 7 | 166 | 3 | 2 | 130 | 186 | .309 | .362 | .353 | .715 | 34.7 |
| Frank O'Rourke | 1914-1928 | 2028 | 7177 | 890 | 2128 | 303 | 100 | 24 | 826 | 184 | 101 | 434 | 363 | .297 | .340 | .377 | .716 | 147.8 |
| Queenie O'Rourke | 1915-1918 | 198 | 613 | 34 | 132 | 14 | 5 | 3 | 47 | 2 | 1 | 30 | 95 | .215 | .252 | .269 | .521 | 3.2 |
| Ernie Orsatti | 1927-1929 | 414 | 1512 | 201 | 488 | 118 | 27 | 7 | 189 | 4 | 6 | 154 | 120 | .323 | .385 | .450 | .835 | 49.6 |
| Al Orth | 1896-1907 | 222 | 609 | 64 | 151 | 9 | 2 | 0 | 54 | 10 | 11 | 17 | 94 | .248 | .272 | .269 | .541 | 4.0 |
| Fred Osborn | 1909-1911 | 67 | 141 | 24 | 44 | 2 | 2 | 0 | 10 | 18 | 9 | 3 | 8 | .312 | .344 | .355 | .699 | 3.9 |
| Player | From-To | G | AB | R | H | 2B | 3B | HR | RBI | SB | CS | BB | SO | AVG | OBP | SLG | OPS | OWS |
| Tiny Osborne | 1922-1926 | 121 | 263 | 26 | 62 | 7 | 3 | 0 | 19 | 1 | 1 | 4 | 78 | .236 | .255 | .285 | .540 | 0.9 |
| Bill Otey | 1911-1912 | 20 | 30 | 3 | 10 | 1 | 0 | 0 | 3 | 0 | 0 | 1 | 11 | .333 | .355 | .367 | .722 | 0.6 |
| Mel Ott | 1926-1929 | 441 | 1595 | 204 | 454 | 73 | 22 | 21 | 215 | 10 | 5 | 142 | 172 | .285 | .341 | .397 | .738 | 34.4 |
| Orval Overall | 1905-1908 | 34 | 94 | 8 | 12 | 0 | 0 | 0 | 4 | 2 | 1 | 1 | 18 | .128 | .153 | .128 | .281 | 0.0 |
| Frank Owen | 1901-1916 | 352 | 932 | 38 | 56 | 17 | 3 | 1 | 40 | 1 | 0 | 13 | 467 | .060 | .073 | .088 | .161 | 0.2 |
| Frank Owens | 1908-1921 | 1546 | 5709 | 647 | 1527 | 218 | 88 | 58 | 819 | 23 | 21 | 407 | 647 | .267 | .314 | .367 | .681 | 121.0 |
| Andy Oyler | 1906-1914 | 589 | 1809 | 171 | 374 | 41 | 7 | 10 | 152 | 39 | 12 | 143 | 98 | .207 | .289 | .254 | .542 | 14.8 |
37 Players | ||||||||||||||||||
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