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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Pedro Baez | 0-1 | 1 | 0 | 1.000 | 3.20 | 22 | 0 | 0 | 0 | 4 | 25.1 | 21 | 9 | 5 | 9 | 28 |
| Manuel Baguinon | -1-1 | 9 | 27 | .250 | 4.41 | 44 | 44 | 3 | 1 | 0 | 246.2 | 246 | 121 | 45 | 92 | 178 |
| Homer Bailey | 0-2 | 0 | 1 | .000 | 7.66 | 6 | 4 | 0 | 0 | 0 | 22.1 | 38 | 19 | 3 | 9 | 21 |
| Scott Baker | 0-7 | 0 | 1 | .000 | 10.80 | 5 | 0 | 0 | 0 | 1 | 3.1 | 7 | 4 | 1 | 2 | 1 |
| Johnny Barbato | 0-1 | 5 | 3 | .625 | 4.62 | 33 | 0 | 0 | 0 | 2 | 50.2 | 57 | 26 | 5 | 17 | 41 |
| Tony Barnette | 0-1 | 1 | 2 | .333 | 4.10 | 40 | 0 | 0 | 0 | 1 | 52.2 | 50 | 24 | 5 | 26 | 49 |
| Tucker Barnhart | 0-1 | 0 | 0 | .000 | 36.00 | 1 | 0 | 0 | 0 | 0 | 1.0 | 3 | 4 | 0 | 2 | 0 |
| Aaron Barrett | 1-1 | 3 | 4 | .429 | 3.31 | 79 | 0 | 0 | 0 | 4 | 87.0 | 80 | 32 | 5 | 24 | 97 |
| Chris Bassitt | 0-2 | 0 | 0 | .000 | 6.75 | 2 | 0 | 0 | 0 | 1 | 5.1 | 4 | 4 | 2 | 4 | 4 |
| Matt Belisle | 1-1 | 8 | 1 | .889 | 4.36 | 44 | 0 | 0 | 0 | 2 | 66.0 | 66 | 32 | 4 | 22 | 52 |
| Dellin Betances | -1-1 | 8 | 11 | .421 | 6.53 | 95 | 0 | 0 | 0 | 41 | 114.1 | 105 | 83 | 16 | 83 | 164 |
| Chad Bettis | 0-2 | 0 | 1 | .000 | 0.00 | 7 | 0 | 0 | 0 | 1 | 11.1 | 9 | 0 | 1 | 1 | 8 |
| Michael Blazek | 1-1 | 3 | 1 | .750 | 1.73 | 87 | 0 | 0 | 0 | 8 | 99.0 | 84 | 19 | 5 | 41 | 97 |
| Jerry Blevins | 0-1 | 2 | 2 | .500 | 3.10 | 12 | 0 | 0 | 0 | 0 | 20.1 | 15 | 7 | 3 | 3 | 16 |
| Mike Bolsinger | 0-2 | 1 | 1 | .500 | 2.16 | 7 | 0 | 0 | 0 | 1 | 16.2 | 10 | 4 | 2 | 5 | 13 |
| Matt Bowman | 0-1 | 4 | 4 | .500 | 4.90 | 76 | 0 | 0 | 0 | 0 | 125.0 | 134 | 68 | 11 | 43 | 78 |
| Brad Boxberger | 0-1 | 4 | 0 | 1.000 | 4.29 | 34 | 0 | 0 | 0 | 3 | 42.0 | 32 | 20 | 5 | 13 | 48 |
| Matt Boyles | 0-2 | 3 | 0 | 1.000 | 4.29 | 15 | 0 | 0 | 0 | 0 | 21.0 | 22 | 10 | 1 | 11 | 27 |
| Brad Brach | 0-2 | 1 | 2 | .333 | 5.66 | 37 | 0 | 0 | 0 | 0 | 47.2 | 53 | 30 | 7 | 27 | 39 |
| Silvino Bracho | 0-1 | 2 | 0 | 1.000 | 2.33 | 26 | 0 | 0 | 0 | 0 | 27.0 | 20 | 7 | 2 | 7 | 28 |
| Ryan Braun | 3-1 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 0 | 1.2 | 2 | 0 | 0 | 1 | 0 |
| Zach Britton | 2-1 | 7 | 9 | .438 | 2.67 | 83 | 0 | 0 | 0 | 43 | 94.1 | 97 | 28 | 6 | 19 | 118 |
| Rex Brothers | 0-3 | 1 | 0 | 1.000 | 6.59 | 30 | 0 | 0 | 0 | 2 | 28.2 | 21 | 21 | 5 | 32 | 40 |
| Madison Bumgarner | 0-1 | 6 | 5 | .545 | 2.59 | 14 | 14 | 2 | 0 | 0 | 97.1 | 85 | 28 | 3 | 10 | 86 |
| Matt Bush | 0-7 | 1 | 1 | .500 | 8.59 | 11 | 0 | 0 | 0 | 0 | 14.2 | 19 | 14 | 3 | 5 | 16 |
