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| Name | Team | Age |
| Koichi Yamanaka | Retired (2025, Age 36) | 63 |
| Drafted | Position | Bats/Throws |
| Round 1, Pick 8 (2014) |
RF | B/R |
| League | Option Years
|
Majors Service Time |
| Harold Baines League | 0 | 9 years (9 games) |
| Total Rating
|
Arm | Range |
| Contact vs R | Contact vs L | Speed |
| Power vs R | Power vs L | Bunting |
| Endurance | Velocity | Control |
| Leadership
|
Mentor vs RHP
|
Mentor vs LHP
|
| Health
|
Injured Days
|
Birthday |
| 0 | 7/10/1989 | |
| WS Rings | WS Appearances | LCS Appearances |
| 3 | 3 | 4 |
| Alt Pos (RF) | Alt Pos (2B) | Alt Pos (LF) |
| (98.8 %) | (21.5 %) | (2.3 %) |
Stats | Splits | Playoffs | Positions | Improvements | Past Skills | Awards | Fielding | Game Log
| Year | Type
|
Chances
|
Active | GS | Injured | Contact vs R | Power vs R | Contact vs L | Power vs L | Speed | Arm | Range | Total |
| 2014 | Minors | 8.00 | 1 / 3 | 0 / 0 | 0 / 1 | 0 / 2 | 1 / 1 | 0 / 0 | 1 / 1 | 3 / 8 | |||
| 2015 | Minors | 51.00 | 2 / 14 | 0 / 10 | 1 / 5 | 0 / 8 | 0 / 5 | 1 / 4 | 3 / 5 | 7 / 51 | |||
| 2016 | Minors | 59.00 | 1 / 6 | 3 / 10 | 1 / 11 | 2 / 10 | 0 / 9 | 5 / 8 | 3 / 5 | 15 / 59 | |||
| 2017 | Minors | 7.00 | 0 / 0 | 0 / 0 | 0 / 0 | 1 / 2 | 0 / 1 | 1 / 2 | 0 / 2 | 2 / 7 | |||
| 2017 | Majors | 51.69 | 124 | 105 | 20 | 0 / 12 | 0 / 2 | 0 / 9 | 0 / 5 | 0 / 9 | 5 / 7 | 0 / 7 | 5 / 51 |
| 2018 | Majors | 64.33 | 154 | 129 | 8 | 0 / 7 | 0 / 5 | 0 / 8 | 0 / 11 | 1 / 11 | 0 / 8 | 2 / 14 | 3 / 64 |
| 2019 | Majors | 67.32 | 162 | 135 | 0 | 0 / 8 | 0 / 17 | 0 / 6 | 0 / 4 | 0 / 16 | 0 / 7 | 0 / 9 | 0 / 67 |
| 2020 | Majors | 67.32 | 162 | 135 | 0 | 0 / 16 | 0 / 13 | 0 / 5 | 0 / 9 | 0 / 7 | 0 / 6 | 0 / 11 | 0 / 67 |
| 2021 | Majors | 67.32 | 162 | 135 | 0 | 1 / 10 | 1 / 13 | 0 / 8 | 0 / 10 | 0 / 10 | 1 / 12 | 0 / 4 | 3 / 67 |
| 2022 | Majors | 64.21 | 162 | 135 | 0 | 0 / 9 | 0 / 10 | 0 / 10 | 0 / 7 | 0 / 13 | 0 / 6 | 0 / 9 | 0 / 64 |
| 2023 | Majors | 38.05 | 162 | 46 | 0 | 0 / 4 | -5 / 5 | -1 / 6 | -4 / 4 | -8 / 7 | -1 / 5 | -3 / 7 | -22 / 38 |
| 2024 | Majors | 39.06 | 162 | 60 | 0 | -2 / 8 | -6 / 6 | 0 / 6 | -3 / 1 | -10 / 4 | 0 / 8 | -2 / 6 | -23 / 39 |
| 2025 | Majors | 15.95 | 162 | 0 | 0 | -4 / 3 | -2 / 1 | -6 / 3 | -2 / 3 | -3 / 2 | 0 / 0 | 0 / 3 | -17 / 15 |
| Total | 1412 | 880 | 28 | -1 / 100 | -9 / 92 | -5 / 78 | -6 / 76 | -19 / 95 | 12 / 73 | 4 / 83 | -24 / 597 |
| Date | Transaction |
| 2025-11-01 | Koichi Yamanaka has retired from the Philadelphia Jesuits |
| 2022-05-07 | Trade #1361901 has been completed between the Philadelphia Jesuits and the Boston Patriots. The Boston Patriots receive Hod Bauer, Draft Pick 2025 Round 2 PHI (Brad Pascual), Draft Pick 2024 Round 2 PHI (Bryan Taylor) from the Philadelphia Jesuits in exchange for Koichi Yamanaka. |
| 2022-05-05 | The Boston Patriots have placed Koichi Yamanaka on the trade block. |
| 2018-06-08 | Koichi Yamanaka of the Boston Patriots is injured and is expected to be out 9 days. |
| 2017-06-26 | Koichi Yamanaka of the Boston Patriots is injured and is expected to be out 24 days. |
| 2017-04-21 | The Boston Patriots have promoted Koichi Yamanaka to the major league team. The Boston Patriots have promoted Phil Poholsky to the major league team. The Boston Patriots have sent Dick Jones to the minors. The Boston Patriots have waived John Force. |