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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Yamada, Hidehira | SP | Saitama Lions | 19 | 06/04/2025 | Toyoura | JPN | Right | Right | 6' 0" | 180 lbs | - |
| Yamada, Tatsui | 1B | Orix Buffaloes | 23 | 03/29/2021 | Mishima | JPN | Right | Right | 6' 3" | 230 lbs | - |
| Yamaguchi, Iwane | C | Fukuoka Hawks | 28 | 05/02/2016 | Takamatsu | JPN | Right | Right | 6' 0" | 210 lbs | - |
| Yamaguchi, Ken | RF | Hanshin Tigers | 22 | 11/25/2021 | Himeji | JPN | Left | Left | 6' 2" | 190 lbs | - |
| Yamaguchi, Naofumi | 1B | Yomiuri Giants | 23 | 10/25/2021 | Yaizu | JPN | Left | Left | 6' 2" | 230 lbs | - |
| Yamaguchi, Noritoshi | SP | Free Agent | 18 | 09/28/2026 | Miyazaki | JPN | Right | Right | 5' 11" | 165 lbs | - |
| Yamaguchi, Yasujiro | CF | Fukuoka Hawks | 26 | 08/31/2018 | Higashikurume | JPN | Right | Right | 6' 2" | 210 lbs | - |
| Yamamoto, Naoki | LF | Yokohama BayStars | 25 | 01/02/2019 | Tottori | JPN | Right | Right | 5' 11" | 210 lbs | - |
| Yamamoto, Razan | MR | Chunichi Dragons | 33 | 10/09/2011 | Okazaki | JPN | Left | Right | 6' 2" | 185 lbs | $950,000 |
| Yamamoto, Ryoma | C | Free Agent | 18 | 11/09/2025 | Aikawa | JPN | Right | Right | 6' 0" | 195 lbs | - |
| Yamamoto, Tamasaburo | SP | Orix Buffaloes | 27 | 07/27/2017 | Iida | JPN | Left | Left | 6' 0" | 200 lbs | $100,000 |
| Yamamoto, Teruo | SP | Fukuoka Hawks | 27 | 02/13/2017 | Moriguchi | JPN | Right | Right | 6' 3" | 220 lbs | $2,800,000 |
| Yamamoto, Tsuramatsu | MR | Hanshin Tigers | 33 | 02/22/2011 | Tagawa | JPN | Left | Right | 6' 0" | 190 lbs | $200,000 |
| Yamamoto, Yasutoki | LF | Yokohama BayStars | 39 | 11/07/2004 | Wakayama | JPN | Left | Right | 6' 0" | 195 lbs | $160,000 |
| Yamanaka, Masamune | SP | Orix Buffaloes | 24 | 10/08/2020 | Yokohama | JPN | Left | Left | 6' 2" | 200 lbs | $100,000 |
| Yamasaki, Mitsuzuka | MR | Chiba Marines | 33 | 12/25/2010 | Kofu | JPN | Right | Right | 6' 0" | 235 lbs | $100,000 |
| Yamashita, Kikaku | SS | Yokohama BayStars | 19 | 02/15/2025 | Tadotsu | JPN | Switch | Right | 5' 10" | 170 lbs | - |
| Yamashita, Yasuo | SP | Fukuoka Hawks | 25 | 03/07/2019 | Tokyo | JPN | Left | Left | 6' 3" | 205 lbs | $1,300,000 |
| Yi, Joon-suk | SP | Yokohama BayStars | 18 | 10/31/2026 | Koyang | KOR | Right | Right | 6' 3" | 190 lbs | - |
| Yokoyama, Tadayuki | 2B | Hanshin Tigers | 24 | 06/06/2020 | Shinnanyo | JPN | Right | Right | 6' 0" | 185 lbs | - |
| Yokoyama, Toshimichi | SP | Yomiuri Giants | 29 | 08/19/2015 | Fukagawa | JPN | Left | Left | 6' 0" | 220 lbs | $1,100,000 |
| Yoshida, Izo | SP | Fukuoka Hawks | 24 | 11/01/2020 | Goshogawara | JPN | Right | Right | 6' 0" | 200 lbs | - |
| Yoshimura, Matsu | SS | Fukuoka Hawks | 20 | 11/20/2023 | Uji | JPN | Right | Right | 6' 1" | 190 lbs | - |
| Younger, Colin | 3B | Yokohama BayStars | 34 | 09/29/2010 | Birmingham | ENG | Right | Right | 5' 11" | 205 lbs | - |
| Yu, Joong-hee | SP | Free Agent | 19 | 01/30/2025 | Hwasun | KOR | Left | Left | 6' 4" | 200 lbs | - |
