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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Machado, Mauro | MR | Fukuoka Hawks | 36 | 04/29/2008 | New York | USA | Left | Right | 6' 7" | 245 lbs | $1,300,000 |
| Maglalang, Dakila | CF | Chunichi Dragons | 19 | 07/04/2025 | Domoclay | PHI | Left | Left | 5' 11" | 185 lbs | - |
| Maier, Elliot | LF | Hanshin Tigers | 33 | 05/03/2011 | Queens | USA | Right | Right | 6' 5" | 260 lbs | $3,360,000 |
| Maki, John | 1B | Fukuoka Hawks | 34 | 08/08/2010 | Orangeville | CAN | Right | Right | 6' 2" | 255 lbs | $100,000 |
| Maldonado, Félix | C | Orix Buffaloes | 28 | 09/11/2016 | Buffalo | USA | Right | Right | 5' 8" | 205 lbs | $288,000 |
| Maldonado, Pepe | 1B | Yokohama BayStars | 33 | 12/24/2010 | San German | PUR | Right | Right | 6' 3" | 255 lbs | - |
| Mallett, Bob | SP | Saitama Lions | 34 | 04/12/2010 | Saskatoon | CAN | Right | Right | 6' 1" | 240 lbs | $1,900,000 |
| Manuel, Pedro | MR | Chunichi Dragons | 36 | 02/15/2008 | Los Angeles | USA | Switch | Right | 6' 0" | 225 lbs | $100,000 |
| Mar, Li | MR | Yomiuri Giants | 38 | 12/02/2005 | Melbourne | AUS | Right | Right | 6' 2" | 215 lbs | $180,000 |
| March, Bob | MR | Yomiuri Giants | 36 | 08/31/2008 | Toronto | CAN | Right | Right | 6' 1" | 240 lbs | $352,000 |
| Marks, Barney | 2B | Orix Buffaloes | 39 | 06/11/2005 | Sacramento | USA | Right | Right | 6' 2" | 175 lbs | $170,000 |
| Martínez, Juan | MR | Chunichi Dragons | 42 | 05/09/2002 | Cuautla | MEX | Right | Right | 5' 10" | 235 lbs | - |
| Masuda, Tadahisa | 1B | Fukuoka Hawks | 25 | 01/26/2019 | Tatsuno | JPN | Switch | Right | 6' 0" | 225 lbs | $100,000 |
| Matsubara, Oda | C | Chunichi Dragons | 34 | 05/01/2010 | Kani | JPN | Switch | Right | 6' 6" | 225 lbs | - |
| Matsuda, Hiroyuki | SS | Yomiuri Giants | 27 | 04/15/2017 | Tokyo | JPN | Right | Right | 6' 1" | 205 lbs | - |
| Matsui, Tadasu | SP | Fukuoka Hawks | 24 | 02/19/2020 | Kawasaki | JPN | Switch | Left | 6' 7" | 235 lbs | $100,000 |
| Matsumoto, Seishiro | 3B | Yomiuri Giants | 23 | 02/10/2021 | Tanashi | JPN | Left | Right | 6' 2" | 215 lbs | - |
| Matsumoto, Yoshifumi | CF | Chunichi Dragons | 21 | 06/22/2023 | Tokyo | JPN | Switch | Right | 5' 11" | 185 lbs | - |
| Matsumura, Ikki | SS | Chiba Marines | 22 | 02/15/2022 | Hirakata | JPN | Switch | Right | 6' 1" | 195 lbs | $100,000 |
| Matsushita, Taro | 1B | Chiba Marines | 38 | 08/20/2006 | Higashikurume | JPN | Left | Left | 6' 1" | 255 lbs | $160,000 |
| Medina, Luciano | LF | Chiba Marines | 34 | 03/15/2010 | Boise | USA | Switch | Left | 6' 3" | 235 lbs | $960,000 |
| Mejía, Albert | SS | Yomiuri Giants | 35 | 10/28/2009 | Madrid | ESP | Right | Right | 6' 0" | 180 lbs | $600,000 |
| Mejía, José | RF | Yokohama BayStars | 37 | 06/27/2007 | Reidsville | USA | Switch | Right | 6' 1" | 215 lbs | $1,300,000 |
| Memoto, Yasuhiro | RF | Orix Buffaloes | 28 | 04/02/2016 | Hachioji | JPN | Left | Left | 6' 0" | 215 lbs | - |
| Miller, Dale | MR | Fukuoka Hawks | 30 | 06/24/2014 | Waterloo | USA | Right | Right | 6' 5" | 225 lbs | $350,000 |
| Miller, Eddie | MR | Saitama Lions | 29 | 09/07/2015 | Live Oak | USA | Right | Right | 6' 5" | 235 lbs | - |
| Miller, Millard | MR | Hanshin Tigers | 37 | 07/06/2007 | Lorton | USA | Left | Right | 6' 5" | 260 lbs | $273,000 |
| Miller, Rich | MR | Fukuoka Hawks | 27 | 01/29/2017 | Nevada | USA | Left | Left | 5' 10" | 185 lbs | - |
| Miyakawa, Kiyohira | CF | Yokohama BayStars | 30 | 12/01/2013 | Yokohama | JPN | Right | Right | 6' 1" | 225 lbs | $100,000 |
| Miyake, Matsu | 3B | Fukuoka Hawks | 33 | 12/04/2010 | Osaka | JPN | Right | Right | 6' 2" | 215 lbs | $1,200,000 |
| Miyazaki, Nakamaro | 2B | Chiba Marines | 24 | 09/14/2020 | Tokyo | JPN | Right | Right | 5' 11" | 175 lbs | $100,000 |
| Miyazaki, Naomi | LF | Saitama Lions | 31 | 09/10/2013 | Tamano | JPN | Right | Right | 6' 4" | 170 lbs | $3,343,200 |
| Mizutani, Kagehisa | SP | Chiba Marines | 26 | 02/03/2018 | Nagano | JPN | Right | Right | 6' 3" | 225 lbs | $100,000 |
| Mojica, Jorge | SS | Saitama Lions | 36 | 02/14/2008 | Holguín | CUB | Right | Right | 6' 2" | 215 lbs | $160,000 |
| Montgomery, Greg | 2B | Fukuoka Hawks | 34 | 04/20/2010 | Queens | USA | Right | Right | 6' 0" | 190 lbs | $160,000 |
| Moreno, Juan | SS | Yokohama BayStars | 36 | 07/28/2008 | Talcahuano | CHI | Switch | Right | 5' 11" | 185 lbs | - |
| Moreno, Tony | 1B | Orix Buffaloes | 35 | 07/17/2009 | Palenque | MEX | Right | Right | 6' 1" | 280 lbs | $170,000 |
| Mori, Takaaki | LF | Yomiuri Giants | 21 | 04/14/2023 | Okazaki | JPN | Left | Left | 6' 1" | 175 lbs | $100,000 |
| Mori, Yasuhiko | MR | Yokohama BayStars | 27 | 01/15/2017 | Zentsuji | JPN | Left | Right | 6' 2" | 195 lbs | - |
| Mori, Yoichi | SS | Fukuoka Hawks | 19 | 05/26/2025 | Sapporo | JPN | Right | Right | 6' 0" | 180 lbs | - |
| Morita, Magobei | 1B | Free Agent | 36 | 02/07/2008 | Chofu | JPN | Right | Right | 6' 3" | 260 lbs | - |
| Morita, Takanori | 2B | Saitama Lions | 26 | 02/17/2018 | Tomioka | JPN | Left | Right | 6' 3" | 230 lbs | $3,800,000 |
| Mosley, River | SP | Yokohama BayStars | 30 | 07/19/2014 | San Luis | USA | Switch | Right | 5' 10" | 185 lbs | $1,500,000 |
| Moss, Gabriel | MR | Chunichi Dragons | 35 | 07/12/2009 | Bayamón | PUR | Right | Right | 6' 6" | 255 lbs | $480,000 |
| Mota, Crespín | SP | Orix Buffaloes | 27 | 12/24/2016 | Camarillo | USA | Right | Right | 6' 2" | 210 lbs | $360,000 |
| Mummert, Benjamin | 3B | Yokohama BayStars | 38 | 07/11/2006 | Acton | USA | Right | Right | 6' 2" | 210 lbs | $160,000 |
| Murakami, Ryobe | LF | Fukuoka Hawks | 23 | 02/17/2021 | Tokyo | JPN | Right | Right | 6' 1" | 210 lbs | - |
| Murakami, Tashiro | MR | Chiba Marines | 33 | 01/21/2011 | Sue | JPN | Right | Right | 6' 2" | 235 lbs | $1,148,000 |
| Murphy, Dave | MR | Chunichi Dragons | 32 | 02/28/2012 | Enid | USA | Right | Right | 5' 8" | 195 lbs | $1,860,000 |
| Musson, Mark | 3B | Chiba Marines | 36 | 04/07/2008 | Walcott | USA | Right | Right | 6' 1" | 190 lbs | $170,000 |
