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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Mack MacDonald | 0-2025 | 1 | 1 | .500 | 4.57 | 30 | 0 | 0 | 0 | 1 | 41.1 | 36 | 21 | 6 | 20 | 51 |
| Ken Mace | 0-2026 | 5 | 1 | .833 | 3.70 | 39 | 0 | 0 | 0 | 6 | 41.1 | 32 | 17 | 4 | 24 | 51 |
| Kelsey MacGillivary | 1-2025 | 10 | 11 | .476 | 3.04 | 34 | 34 | 0 | 0 | 0 | 210.1 | 208 | 71 | 8 | 67 | 189 |
| Juan Machado | 0-2026 | 0 | 2 | .000 | 8.44 | 2 | 2 | 0 | 0 | 0 | 10.2 | 17 | 10 | 0 | 3 | 8 |
| Ángel Macías | 0-2026 | 0 | 0 | .000 | 0.00 | 1 | 0 | 0 | 0 | 1 | 1.0 | 2 | 0 | 0 | 0 | 0 |
| Daniel Mack | 0-2026 | 2 | 1 | .667 | 4.50 | 13 | 1 | 0 | 0 | 1 | 26.0 | 31 | 13 | 2 | 8 | 21 |
| Kyle MacRae | 0-2024 | 1 | 5 | .167 | 3.12 | 34 | 2 | 1 | 0 | 3 | 66.1 | 62 | 23 | 1 | 24 | 67 |
| José Maestas | 0-2024 | 1 | 0 | 1.000 | 2.35 | 1 | 1 | 0 | 0 | 0 | 7.2 | 10 | 2 | 0 | 0 | 5 |
| Reynaldo Maestas | 0-2026 | 7 | 7 | .500 | 2.25 | 75 | 0 | 0 | 0 | 34 | 88.0 | 56 | 22 | 9 | 28 | 116 |
| Kenny Makris | 0-2026 | 0 | 0 | .000 | 3.98 | 7 | 0 | 0 | 0 | 1 | 20.1 | 28 | 9 | 1 | 8 | 16 |
| Ken Maksimenov | 0-2023 | 1 | 1 | .500 | 5.28 | 5 | 1 | 0 | 0 | 0 | 15.1 | 19 | 9 | 0 | 8 | 20 |
| Esteban Marino | 0-2024 | 1 | 2 | .333 | 3.90 | 11 | 2 | 0 | 0 | 1 | 27.2 | 22 | 12 | 3 | 11 | 28 |
| Tyrone Marone | 0-2026 | 2 | 6 | .250 | 3.43 | 29 | 0 | 0 | 0 | 5 | 44.2 | 34 | 17 | 5 | 14 | 41 |
| Jesús Márquez | 0-2024 | 4 | 4 | .500 | 2.58 | 41 | 0 | 0 | 0 | 5 | 59.1 | 55 | 17 | 1 | 24 | 72 |
| Ramón Márquez | 1-2026 | 6 | 5 | .545 | 2.54 | 57 | 15 | 0 | 0 | 8 | 134.2 | 111 | 38 | 6 | 48 | 145 |
| Armando Marrero | 0-2026 | 6 | 3 | .667 | 1.88 | 13 | 13 | 1 | 0 | 0 | 86.1 | 61 | 18 | 3 | 29 | 90 |
| Cristiano Marron | 0-2023 | 2 | 2 | .500 | 2.04 | 7 | 7 | 0 | 0 | 0 | 39.2 | 32 | 9 | 2 | 9 | 28 |
| José Marroquín | 1-2026 | 5 | 7 | .417 | 2.31 | 63 | 0 | 0 | 0 | 7 | 105.1 | 71 | 27 | 3 | 49 | 121 |
| Marvin Martin | 0-2023 | 8 | 3 | .727 | 2.74 | 23 | 12 | 0 | 0 | 0 | 82.0 | 55 | 25 | 3 | 34 | 112 |
| Andrés Martínez | 0-2026 | 1 | 3 | .250 | 3.55 | 34 | 0 | 0 | 0 | 8 | 33.0 | 40 | 13 | 0 | 16 | 25 |
| Andrés Martínez | 0-2020 | 1 | 0 | 1.000 | 1.20 | 2 | 2 | 0 | 0 | 0 | 15.0 | 13 | 2 | 0 | 4 | 14 |
| Daniel Martínez | 0-2023 | 0 | 2 | .000 | 3.18 | 5 | 5 | 0 | 0 | 0 | 28.1 | 27 | 10 | 0 | 9 | 24 |
| Francisco Martínez | 1-2023 | 7 | 6 | .538 | 2.00 | 23 | 22 | 0 | 0 | 0 | 135.1 | 93 | 30 | 6 | 47 | 135 |
| José Martínez | 0-2020 | 2 | 3 | .400 | 3.68 | 5 | 5 | 2 | 1 | 0 | 36.2 | 40 | 15 | 2 | 7 | 32 |
| Luis Miguel Martínez | 0-2024 | 2 | 3 | .400 | 4.76 | 44 | 4 | 1 | 1 | 1 | 109.2 | 131 | 58 | 3 | 47 | 75 |
| Nick Mason | 0-2024 | 5 | 9 | .357 | 3.90 | 19 | 19 | 2 | 1 | 0 | 115.1 | 112 | 50 | 5 | 35 | 73 |
| Miguel Matos | 0-2026 | 0 | 0 | .000 | 0.00 | 2 | 0 | 0 | 0 | 0 | 2.2 | 0 | 0 | 0 | 2 | 1 |
| Vicente Matos | 0-4 | 0 | 0 | .000 | 5.12 | 8 | 0 | 0 | 0 | 0 | 19.1 | 20 | 11 | 1 | 13 | 16 |
| Emílio Mavarro | 2-2026 | 9 | 7 | .562 | 2.60 | 28 | 28 | 0 | 0 | 0 | 166.1 | 123 | 48 | 6 | 62 | 206 |
| Leif Mayer | 0-2022 | 6 | 8 | .429 | 3.93 | 24 | 18 | 0 | 0 | 0 | 119.0 | 106 | 52 | 6 | 56 | 107 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Baker Mayfield | 0-2026 | 10 | 22 | .312 | 4.03 | 45 | 45 | 2 | 0 | 0 | 288.1 | 316 | 129 | 9 | 93 | 141 |
| Billy Mays | 0-2026 | 6 | 6 | .500 | 2.39 | 60 | 0 | 0 | 0 | 6 | 60.1 | 41 | 16 | 2 | 27 | 63 |
| Brandon McAllister | 0-2024 | 3 | 0 | 1.000 | 2.22 | 32 | 0 | 0 | 0 | 4 | 48.2 | 43 | 12 | 2 | 21 | 53 |
| Horatio McAllister | 3-2025 | 10 | 6 | .625 | 4.15 | 24 | 24 | 0 | 0 | 0 | 143.0 | 155 | 66 | 5 | 55 | 128 |
| Francis McBride | 0-2020 | 4 | 5 | .444 | 1.86 | 14 | 10 | 0 | 0 | 0 | 72.2 | 58 | 15 | 1 | 22 | 74 |
| Ryan McCall | 0-2018 | 0 | 0 | .000 | 1.17 | 1 | 1 | 0 | 0 | 0 | 7.2 | 5 | 1 | 0 | 2 | 9 |
| Kevin McCoy | 0-2022 | 2 | 2 | .500 | 3.83 | 19 | 0 | 0 | 0 | 0 | 42.1 | 45 | 18 | 3 | 12 | 28 |
| Kevin McCrary | 0-2026 | 1 | 4 | .200 | 2.82 | 30 | 0 | 0 | 0 | 4 | 60.2 | 53 | 19 | 6 | 25 | 53 |
| Ed McCullough | 0-2024 | 1 | 0 | 1.000 | 7.47 | 7 | 0 | 0 | 0 | 0 | 15.2 | 22 | 13 | 0 | 10 | 8 |
| Daniel McGovern | 0-2023 | 0 | 0 | .000 | 0.00 | 2 | 0 | 0 | 0 | 1 | 5.1 | 3 | 0 | 0 | 2 | 6 |
| Bryan McKinney | 0-2025 | 2 | 10 | .167 | 3.45 | 19 | 19 | 1 | 0 | 0 | 114.2 | 100 | 44 | 6 | 39 | 125 |
| Carlos Medina | 0-2024 | 1 | 1 | .500 | 0.75 | 14 | 0 | 0 | 0 | 0 | 24.0 | 10 | 2 | 0 | 8 | 31 |
| Jesús Medina | 0-2024 | 6 | 10 | .375 | 4.20 | 20 | 20 | 0 | 0 | 0 | 128.2 | 119 | 60 | 4 | 47 | 138 |
| Wyatt Meek | 0-2026 | 0 | 0 | .000 | 3.38 | 3 | 0 | 0 | 0 | 0 | 2.2 | 4 | 1 | 1 | 1 | 0 |
| Currito Melena | 0-2025 | 8 | 13 | .381 | 3.33 | 25 | 25 | 1 | 0 | 0 | 148.2 | 142 | 55 | 6 | 44 | 107 |
| Denis Melis | 0-2026 | 0 | 0 | .000 | 1.74 | 21 | 0 | 0 | 0 | 7 | 31.0 | 18 | 6 | 0 | 8 | 43 |
| Javier Mena | 0-2026 | 0 | 1 | .000 | 4.50 | 8 | 1 | 0 | 0 | 0 | 18.0 | 21 | 9 | 3 | 9 | 13 |
| Julián Menchaca | 0-2026 | 3 | 5 | .375 | 3.98 | 32 | 0 | 0 | 0 | 2 | 40.2 | 36 | 18 | 2 | 26 | 40 |
| César Méndez | 0-2024 | 3 | 2 | .600 | 3.51 | 28 | 0 | 0 | 0 | 3 | 25.2 | 20 | 10 | 1 | 13 | 29 |
| Juan Méndez | 0-2023 | 11 | 8 | .579 | 2.91 | 54 | 19 | 7 | 1 | 8 | 201.0 | 195 | 65 | 10 | 58 | 162 |
| Lorenzo Méndez | 0-2025 | 2 | 3 | .400 | 2.19 | 21 | 6 | 0 | 0 | 5 | 49.1 | 56 | 12 | 3 | 18 | 37 |
| Rafael Méndez | 0-4 | 6 | 3 | .667 | 2.70 | 43 | 1 | 0 | 0 | 4 | 70.0 | 57 | 21 | 5 | 31 | 89 |
| Vitorio Méndez | 5-2024 | 27 | 18 | .600 | 2.79 | 60 | 48 | 7 | 0 | 1 | 387.2 | 341 | 120 | 22 | 116 | 357 |
| Alberto Mendoza | 0-2026 | 5 | 4 | .556 | 1.69 | 30 | 6 | 0 | 0 | 3 | 79.2 | 64 | 15 | 0 | 28 | 77 |
| Iván Mendoza | 0-2026 | 1 | 6 | .143 | 4.31 | 15 | 7 | 0 | 0 | 0 | 62.2 | 54 | 30 | 5 | 28 | 64 |
| Marcos Mesa | 0-2022 | 4 | 1 | .800 | 0.59 | 13 | 0 | 0 | 0 | 1 | 15.1 | 5 | 1 | 0 | 5 | 20 |
| Phil Miles | 0-2021 | 6 | 6 | .500 | 3.64 | 16 | 16 | 1 | 0 | 0 | 101.1 | 99 | 41 | 7 | 30 | 80 |
| Freddy Miranda | 0-2024 | 2 | 0 | 1.000 | 2.85 | 22 | 0 | 0 | 0 | 2 | 47.1 | 41 | 15 | 0 | 20 | 59 |
| Esteban Miroz | 0-4 | 0 | 0 | .000 | 3.35 | 19 | 0 | 0 | 0 | 2 | 45.2 | 39 | 17 | 2 | 34 | 43 |
| José Montalópez | 0-2024 | 6 | 3 | .667 | 2.77 | 51 | 0 | 0 | 0 | 0 | 78.0 | 83 | 24 | 1 | 30 | 48 |
| Player | From-To | W | L | Pct | ERA | G | GS | CG | SHO | SV | IP | H | ER | HR | BB | SO |
| Erasmo Monteagudo | 0-2026 | 4 | 0 | 1.000 | 2.95 | 13 | 2 | 0 | 0 | 1 | 21.1 | 19 | 7 | 1 | 10 | 20 |
| Valentín Montenegro | 0-2024 | 5 | 1 | .833 | 1.94 | 10 | 10 | 1 | 1 | 0 | 69.2 | 56 | 15 | 1 | 23 | 68 |
| Juan Montoya | 1-2022 | 10 | 11 | .476 | 2.45 | 39 | 28 | 6 | 3 | 1 | 238.2 | 206 | 65 | 10 | 73 | 209 |
| José Morales | 0-2026 | 0 | 3 | .000 | 5.24 | 13 | 0 | 0 | 0 | 3 | 22.1 | 31 | 13 | 0 | 14 | 24 |
| José Morales | 1-2023 | 12 | 20 | .375 | 4.03 | 59 | 30 | 0 | 0 | 17 | 203.1 | 202 | 91 | 13 | 85 | 178 |
| Manuel Morales | -1-2021 | 5 | 15 | .250 | 5.30 | 41 | 24 | 0 | 0 | 0 | 168.0 | 193 | 99 | 10 | 77 | 121 |
| Lorenzo Morán | 0-2023 | 1 | 5 | .167 | 6.93 | 15 | 0 | 0 | 0 | 3 | 24.2 | 27 | 19 | 3 | 16 | 17 |
| Alejandro Morín | 0-2026 | 4 | 2 | .667 | 2.75 | 17 | 2 | 0 | 0 | 1 | 39.1 | 30 | 12 | 3 | 15 | 50 |
| Brian Morris | 0-2022 | 4 | 2 | .667 | 1.33 | 8 | 8 | 1 | 1 | 0 | 54.1 | 38 | 8 | 1 | 14 | 45 |
| Alonso Muñíz | 2-2023 | 20 | 8 | .714 | 1.83 | 96 | 18 | 0 | 0 | 7 | 226.1 | 160 | 46 | 6 | 75 | 213 |
| José Muñóz | 1-2026 | 5 | 5 | .500 | 2.53 | 35 | 12 | 0 | 0 | 1 | 103.0 | 88 | 29 | 4 | 40 | 118 |
| Roberto Muñóz | 0-2026 | 0 | 0 | .000 | 0.00 | 4 | 0 | 0 | 0 | 1 | 2.0 | 2 | 0 | 0 | 0 | 1 |
| Christian Mustard | 0-2026 | 5 | 1 | .833 | 0.50 | 31 | 0 | 0 | 0 | 15 | 36.0 | 21 | 2 | 0 | 14 | 45 |
