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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 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Hikaru Yamaguchi | 2031-2040 | 8 | 11 | .421 | 3.98 | 30 | 30 | 0 | 0 | 0 | 171.2 | 165 | 76 | 15 | 77 | 127 |
| Jo Yamasaki | 2037-2041 | 12 | 18 | .400 | 4.67 | 40 | 40 | 2 | 1 | 0 | 240.2 | 226 | 125 | 28 | 113 | 201 |
| Okura Yamasaki | 2041-2041 | 2 | 0 | 1.000 | 2.65 | 12 | 0 | 0 | 0 | 1 | 17.0 | 14 | 5 | 2 | 4 | 18 |
| Akinori Yamauchi | 2036-2040 | 10 | 6 | .625 | 4.44 | 69 | 15 | 0 | 0 | 0 | 182.1 | 217 | 90 | 11 | 50 | 86 |
| Laurel Yanny | 2036-2036 | 4 | 6 | .400 | 5.57 | 16 | 16 | 0 | 0 | 0 | 72.2 | 82 | 45 | 4 | 42 | 45 |
| Mapuana Yara | 2032-2032 | 0 | 1 | .000 | 10.80 | 3 | 0 | 0 | 0 | 0 | 1.2 | 3 | 2 | 0 | 3 | 5 |
| António Ybarra | 2019-2025 | 11 | 25 | .306 | 6.13 | 72 | 41 | 1 | 0 | 1 | 286.1 | 357 | 195 | 30 | 180 | 166 |
| Jorge Ybarra | 2018-2018 | 0 | 0 | .000 | 5.60 | 33 | 0 | 0 | 0 | 0 | 17.2 | 23 | 11 | 2 | 12 | 12 |
| José Ybarra | 2026-2026 | 5 | 0 | 1.000 | 5.47 | 35 | 0 | 0 | 0 | 1 | 74.0 | 92 | 45 | 5 | 63 | 39 |
| Stanley Yelnats | 2029-2029 | 0 | 0 | .000 | 2.25 | 1 | 1 | 0 | 0 | 0 | 4.0 | 4 | 1 | 0 | 1 | 2 |
| Chang-soo Yi | 2039-2039 | 0 | 0 | .000 | 1.74 | 5 | 0 | 0 | 0 | 1 | 10.1 | 8 | 2 | 0 | 6 | 9 |
| Hwa-pyung Yi | 2038-2038 | 4 | 4 | .500 | 2.83 | 33 | 0 | 0 | 0 | 11 | 35.0 | 27 | 11 | 5 | 14 | 35 |
| Kyung-un Yi | 2031-2031 | 4 | 3 | .571 | 1.97 | 47 | 0 | 0 | 0 | 26 | 45.2 | 36 | 10 | 2 | 13 | 30 |
| Seung-soo Yi | 2036-2041 | 5 | 3 | .625 | 4.83 | 24 | 11 | 0 | 0 | 1 | 82.0 | 103 | 44 | 8 | 18 | 55 |
| Won-min Yi | 2034-2035 | 5 | 2 | .714 | 3.33 | 34 | 1 | 0 | 0 | 0 | 92.0 | 95 | 34 | 8 | 47 | 60 |
| Won-u Yi | 2035-2036 | 5 | 6 | .455 | 3.38 | 16 | 16 | 0 | 0 | 0 | 85.1 | 80 | 32 | 9 | 30 | 62 |
| Hakan Yilmanz | 2032-2041 | 19 | 11 | .633 | 3.85 | 184 | 3 | 0 | 0 | 41 | 308.2 | 320 | 132 | 20 | 144 | 275 |
| Tim Yoder | 2034-2037 | 5 | 9 | .357 | 5.40 | 25 | 25 | 0 | 0 | 0 | 136.2 | 153 | 82 | 16 | 65 | 83 |
| Allen Yohemas | 2021-2031 | 3 | 6 | .333 | 3.70 | 19 | 18 | 1 | 0 | 0 | 99.2 | 87 | 41 | 4 | 60 | 78 |
| Sukejuro Yokoyama | 2029-2030 | 4 | 1 | .800 | 2.50 | 17 | 0 | 0 | 0 | 0 | 36.0 | 32 | 10 | 3 | 15 | 28 |
| Toshiki Yokoyama | 2031-2036 | 6 | 5 | .545 | 4.46 | 38 | 0 | 0 | 0 | 11 | 38.1 | 37 | 19 | 4 | 19 | 28 |
| Nam Yee Yong | 2028-2041 | 10 | 19 | .345 | 4.34 | 95 | 63 | 0 | 0 | 11 | 329.2 | 368 | 159 | 32 | 102 | 217 |
| Yoriyoshi Yoshimura | 2031-2031 | 0 | 1 | .000 | 4.40 | 14 | 0 | 0 | 0 | 0 | 30.2 | 27 | 15 | 1 | 19 | 25 |
| Hollis Young | 2017-2019 | 2 | 3 | .400 | 8.04 | 42 | 10 | 0 | 0 | 0 | 99.2 | 140 | 89 | 15 | 66 | 40 |
| Jessie Young | 2036-2036 | 1 | 1 | .500 | 2.45 | 2 | 2 | 0 | 0 | 0 | 11.0 | 12 | 3 | 1 | 3 | 11 |
