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| League History Index | Players | Teams | Managers | Leagues | Leaderboards | Awards | Accomplishments |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Eleuterio Ramos | 1914-1914 | 2 | 0 | 1.000 | 1.42 | 9 | 0 | 0 | 0 | 1 | 12.2 | 12 | 2 | 0 | 5 | 1 |
| Doroteo Ramírez | 1909-1911 | 10 | 11 | .476 | 5.08 | 31 | 22 | 6 | 1 | 1 | 177.0 | 232 | 100 | 0 | 60 | 28 |
| Rafael Ramón | 1910-1914 | 30 | 23 | .566 | 3.93 | 85 | 72 | 6 | 2 | 0 | 489.2 | 564 | 214 | 4 | 160 | 103 |
| Matt Read | 1907-1913 | 4 | 1 | .800 | 4.31 | 49 | 0 | 0 | 0 | 4 | 94.0 | 117 | 45 | 0 | 32 | 19 |
| Bob Rhoads | 1909-1910 | 6 | 14 | .300 | 4.36 | 27 | 23 | 13 | 2 | 0 | 192.0 | 203 | 93 | 1 | 52 | 9 |
| Eliezer Rivera | 1906-1914 | 84 | 114 | .424 | 3.68 | 295 | 227 | 80 | 9 | 3 | 1830.1 | 2053 | 748 | 1 | 521 | 249 |
| Esteban Rivera | 1907-1912 | 25 | 38 | .397 | 4.02 | 89 | 73 | 29 | 1 | 0 | 590.2 | 643 | 264 | 2 | 236 | 137 |
| Bryan Robinson | 1907-1914 | 118 | 97 | .549 | 3.81 | 257 | 253 | 126 | 14 | 0 | 2025.2 | 2216 | 857 | 1 | 664 | 366 |
| Marcos Robles | 1906-1909 | 4 | 3 | .571 | 1.45 | 48 | 0 | 0 | 0 | 5 | 74.1 | 57 | 12 | 1 | 22 | 20 |
| Hernando Rocha | 1909-1914 | 6 | 6 | .500 | 6.26 | 63 | 1 | 0 | 0 | 2 | 129.1 | 179 | 90 | 0 | 63 | 23 |
| Esteban Rodríguez | 1906-1914 | 85 | 80 | .515 | 3.94 | 230 | 191 | 78 | 7 | 1 | 1550.0 | 1704 | 678 | 0 | 641 | 246 |
| Federico Rodríguez | 1912-1914 | 6 | 10 | .375 | 4.62 | 52 | 0 | 0 | 0 | 3 | 64.1 | 76 | 33 | 0 | 38 | 20 |
| Javier Rodríguez | 1906-1909 | 21 | 12 | .636 | 2.54 | 38 | 36 | 22 | 4 | 0 | 312.1 | 280 | 88 | 0 | 75 | 25 |
| Javier Rodríguez | 1906-1914 | 26 | 20 | .565 | 3.91 | 218 | 0 | 0 | 0 | 39 | 304.0 | 383 | 132 | 0 | 82 | 76 |
| Ramón Rodríguez | 1906-1914 | 88 | 80 | .524 | 3.48 | 222 | 184 | 90 | 14 | 3 | 1516.1 | 1680 | 587 | 0 | 375 | 290 |
| Raúl Rodríguez | 1908-1914 | 10 | 15 | .400 | 4.45 | 72 | 23 | 4 | 1 | 1 | 242.2 | 290 | 120 | 2 | 124 | 69 |
| Jorge Rojas | 1908-1914 | 8 | 3 | .727 | 3.18 | 28 | 11 | 3 | 0 | 0 | 121.2 | 130 | 43 | 0 | 36 | 14 |
| Guignard Romanelli | 1906-1914 | 52 | 70 | .426 | 4.00 | 212 | 145 | 59 | 10 | 4 | 1232.1 | 1381 | 548 | 0 | 399 | 174 |
| Rutilio Romero | 1906-1911 | 44 | 49 | .473 | 3.33 | 120 | 106 | 60 | 8 | 1 | 866.1 | 906 | 321 | 0 | 225 | 128 |
| Tomás Ruiz | 1906-1914 | 42 | 50 | .457 | 3.54 | 359 | 0 | 0 | 0 | 103 | 465.0 | 549 | 183 | 0 | 128 | 192 |
| Casimiro Ríos | 1906-1914 | 78 | 75 | .510 | 3.30 | 207 | 171 | 94 | 12 | 5 | 1446.0 | 1484 | 531 | 0 | 480 | 272 |
