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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Erasmo Ramirez | 1-1 | 12 | 4 | .750 | 2.89 | 41 | 16 | 1 | 1 | 2 | 140.0 | 121 | 45 | 13 | 32 | 90 |
| Jose A. Ramirez | 0-1 | 3 | 1 | .750 | 2.94 | 41 | 0 | 0 | 0 | 1 | 64.1 | 44 | 21 | 7 | 24 | 76 |
| Neil Ramirez | -1-1 | 6 | 3 | .667 | 4.45 | 59 | 0 | 0 | 0 | 2 | 64.2 | 67 | 32 | 7 | 45 | 66 |
| A.J. Ramos | 1-1 | 7 | 4 | .636 | 4.14 | 97 | 0 | 0 | 0 | 2 | 124.0 | 102 | 57 | 10 | 68 | 145 |
| Cory Rasmus | 0-3 | 0 | 0 | .000 | 10.80 | 1 | 0 | 0 | 0 | 0 | 1.2 | 3 | 2 | 0 | 2 | 1 |
| Robbie Ray | 0-1 | 2 | 4 | .333 | 4.42 | 7 | 7 | 0 | 0 | 0 | 38.2 | 42 | 19 | 4 | 13 | 33 |
| J.T. Realmuto | 1-1 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 0.2 | 1 | 0 | 0 | 0 | 0 |
| Addison Reed | 0-1 | 1 | 1 | .500 | 1.35 | 11 | 0 | 0 | 0 | 1 | 13.1 | 14 | 2 | 1 | 7 | 16 |
| Jose Reyes | 1-1 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.2 | 4 | 0 | 0 | 0 | 1 |
| Clayton Richard | 0-2 | 2 | 2 | .500 | 6.55 | 4 | 4 | 0 | 0 | 0 | 22.0 | 26 | 16 | 7 | 5 | 12 |
| Garrett Richards | 3-1 | 14 | 13 | .519 | 3.77 | 40 | 40 | 3 | 1 | 0 | 241.0 | 217 | 101 | 20 | 79 | 194 |
| Felipe Rivero | 2-1 | 5 | 4 | .556 | 2.48 | 98 | 0 | 0 | 0 | 1 | 109.0 | 88 | 30 | 3 | 35 | 122 |
| David Robertson | 2-1 | 7 | 7 | .500 | 2.74 | 84 | 0 | 0 | 0 | 48 | 88.2 | 64 | 27 | 5 | 20 | 110 |
| Hansel Robles | 2-1 | 5 | 2 | .714 | 3.07 | 51 | 4 | 0 | 0 | 3 | 93.2 | 81 | 32 | 8 | 28 | 110 |
| Carlos Rodon | 1-1 | 4 | 2 | .667 | 3.87 | 13 | 13 | 1 | 0 | 0 | 88.1 | 81 | 38 | 8 | 27 | 81 |
| Eduardo Rodriguez | 2-1 | 17 | 14 | .548 | 3.68 | 41 | 41 | 1 | 0 | 0 | 259.0 | 266 | 106 | 29 | 63 | 192 |
| Francisco Rodriguez | 0-1 | 6 | 5 | .545 | 3.82 | 97 | 0 | 0 | 0 | 3 | 94.1 | 83 | 40 | 11 | 23 | 107 |
| Wilking Rodriguez | 0-1 | 1 | 4 | .200 | 8.57 | 8 | 8 | 0 | 0 | 0 | 34.2 | 41 | 33 | 7 | 19 | 38 |
| Enny Romero | 0-2 | 2 | 0 | 1.000 | 6.43 | 12 | 0 | 0 | 0 | 1 | 21.0 | 18 | 15 | 5 | 10 | 22 |
| Sergio Romo | 1-1 | 5 | 7 | .417 | 2.72 | 81 | 0 | 0 | 0 | 7 | 99.1 | 99 | 30 | 10 | 21 | 103 |
| Hector Rondon | 0-1 | 5 | 4 | .556 | 3.60 | 90 | 0 | 0 | 0 | 3 | 90.0 | 83 | 36 | 11 | 23 | 77 |
| Jorge Rondon | 1-1 | 9 | 2 | .818 | 3.75 | 78 | 0 | 0 | 0 | 3 | 112.2 | 124 | 47 | 5 | 40 | 85 |
| Trevor Rosenthal | 0-1 | 9 | 8 | .529 | 3.74 | 95 | 0 | 0 | 0 | 38 | 101.0 | 77 | 42 | 8 | 54 | 126 |
| Joe Ross | 0-1 | 3 | 2 | .600 | 4.21 | 8 | 8 | 1 | 0 | 0 | 51.1 | 54 | 24 | 5 | 9 | 28 |
| Tyson Ross | 2-1 | 13 | 18 | .419 | 4.13 | 43 | 43 | 2 | 1 | 0 | 239.2 | 234 | 110 | 22 | 102 | 210 |
| Zac Rosscup | 0-2 | 3 | 2 | .600 | 3.71 | 69 | 0 | 0 | 0 | 0 | 68.0 | 59 | 28 | 8 | 37 | 103 |
| Ben Rowen | 1-1 | 5 | 6 | .455 | 4.49 | 83 | 0 | 0 | 0 | 6 | 120.1 | 140 | 60 | 10 | 37 | 108 |
| Norge Ruiz | 0-1 | 1 | 2 | .333 | 5.05 | 8 | 8 | 0 | 0 | 0 | 41.0 | 52 | 23 | 3 | 12 | 44 |
| Dan Runzler | 0-2 | 0 | 0 | .000 | 0.00 | 3 | 0 | 0 | 0 | 0 | 2.2 | 0 | 0 | 0 | 0 | 1 |
| Hyun-jin Ryu | 4-1 | 20 | 13 | .606 | 3.51 | 44 | 44 | 3 | 1 | 0 | 276.2 | 251 | 108 | 24 | 51 | 208 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
