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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| MacDonald, Lou | 3B | Sacramento River Cats | 28 | 01/10/2014 | Salem | USA | Right | Right | 6' 0" | 200 lbs | $750,000 |
| MacKinney, Toby | SP | Las Vegas Aviators | 27 | 05/21/2014 | Penn Hills | USA | Right | Right | 6' 6" | 205 lbs | - |
| Macías, Lúcio | 1B | Las Vegas Aviators | 23 | 09/06/2018 | Santiago | DOM | Right | Right | 6' 4" | 200 lbs | - |
| Major, Bob | SP | Tacoma Rainiers | 26 | 02/02/2016 | Minneapolis | USA | Right | Right | 6' 5" | 200 lbs | - |
| Makaev, Qabil | 2B | Oklahoma City Dodgers | 31 | 02/24/2011 | Muncie | USA | Right | Right | 6' 0" | 200 lbs | - |
| Maldonado, Juan | C | Reno Aces | 24 | 10/13/2017 | San Francisco | USA | Right | Right | 6' 6" | 200 lbs | $750,000 |
| Marshal, Dan | SP | Tacoma Rainiers | 25 | 08/30/2016 | New York | USA | Left | Left | 6' 6" | 205 lbs | - |
| Marshall, Stan | SP | Sacramento River Cats | 24 | 01/22/2018 | Long Beach | USA | Left | Left | 6' 5" | 210 lbs | - |
| Martin, Greg | C | Tacoma Rainiers | 24 | 04/09/2018 | Central Islip | USA | Right | Right | 6' 2" | 200 lbs | - |
| Martínez, António | 3B | Salt Lake Bees | 25 | 12/26/2016 | Barcelona | VEN | Right | Right | 6' 1" | 200 lbs | - |
| Martínez, Esteban | C | Las Vegas Aviators | 23 | 06/01/2018 | Santo Domingo | DOM | Switch | Right | 5' 11" | 190 lbs | - |
| Martínez, Jorge | SP | Las Vegas Aviators | 24 | 03/29/2018 | Ciudad Bolívar | VEN | Right | Right | 6' 7" | 200 lbs | - |
| Martínez, Juan | RP | Free Agent | 37 | 02/19/2005 | Santa Cruz del Sur | CUB | Left | Right | 6' 1" | 195 lbs | - |
| Martínez, Raúl | RP | Sugar Land Skeeters | 22 | 07/05/2019 | San José de las Matas | DOM | Right | Right | 6' 0" | 175 lbs | $750,000 |
| Martínez, Tomás | 1B | Sugar Land Skeeters | 28 | 02/02/2014 | Pinar del Rio | CUB | Switch | Right | 6' 2" | 225 lbs | - |
| Massey, Darryl | LF | Free Agent | 34 | 02/23/2008 | South Gate | USA | Left | Left | 6' 3" | 200 lbs | - |
| Mathews, Dewitt | 1B | Sacramento River Cats | 35 | 02/11/2007 | Ozark | USA | Right | Right | 6' 4" | 200 lbs | - |
| McCauley, Scotty | LF | Oklahoma City Dodgers | 32 | 12/26/2009 | El Paso | USA | Switch | Right | 6' 0" | 200 lbs | - |
| McDermid, Wilbert | C | Oklahoma City Dodgers | 26 | 02/09/2016 | Surrey | CAN | Left | Right | 6' 4" | 200 lbs | - |
| McKenzie, Mike | RP | Reno Aces | 26 | 01/05/2016 | Penn Hills | USA | Right | Right | 5' 11" | 195 lbs | - |
| Meadows, Chris | RP | Round Rock Express | 25 | 05/07/2017 | Louisville | USA | Right | Left | 6' 6" | 200 lbs | $750,000 |
| Mendoza, Enrico | 1B | Tacoma Rainiers | 27 | 10/04/2014 | Mayagüez | PUR | Right | Right | 6' 1" | 195 lbs | $750,000 |
| Merrills, Mike | RP | Free Agent | 32 | 01/24/2010 | Redondo Beach | USA | Right | Right | 6' 0" | 205 lbs | - |
| Meunier, Yohann | SP | Salt Lake Bees | 27 | 05/30/2014 | Montreal | CAN | Right | Right | 5' 9" | 185 lbs | - |
| Millar, Logan | SP | Reno Aces | 27 | 09/18/2014 | Athens | USA | Right | Right | 6' 4" | 200 lbs | - |
| Miller, Cliff | CF | Albuquerque Isotopes | 26 | 12/13/2015 | Arcata | USA | Switch | Right | 5' 9" | 180 lbs | - |
| Miller, Curt | RP | Free Agent | 28 | 01/01/2014 | Pitman | USA | Right | Right | 6' 2" | 200 lbs | - |
| Miller, Jonathan | CL | Salt Lake Bees | 25 | 07/31/2016 | New Boston | USA | Left | Right | 6' 3" | 200 lbs | $750,000 |
| Miller, Shawn | SP | Sugar Land Skeeters | 26 | 03/07/2016 | Auburn | USA | Left | Right | 6' 7" | 220 lbs | - |
| Miller, Tim | C | Sacramento River Cats | 24 | 04/28/2018 | Eagan | USA | Right | Right | 5' 10" | 185 lbs | - |
| Moon, Jeff | 1B | Albuquerque Isotopes | 23 | 12/04/2018 | Mobile | USA | Right | Left | 6' 8" | 210 lbs | - |
| Moon, Jung-jun | CF | El Paso Chihuahuas | 25 | 01/31/2017 | Goyang | KOR | Right | Left | 6' 1" | 195 lbs | - |
| Moore, Dan | RP | El Paso Chihuahuas | 32 | 07/12/2009 | Vermillion | USA | Right | Right | 5' 9" | 190 lbs | - |
| Moore, Dan | RP | Las Vegas Aviators | 27 | 07/31/2014 | Midvale | USA | Left | Left | 6' 4" | 205 lbs | $750,000 |
| Moore, Max | RP | Free Agent | 34 | 09/25/2007 | Anacortes | USA | Right | Right | 6' 0" | 200 lbs | - |
| Morales, António | RF | Salt Lake Bees | 29 | 10/12/2012 | Aguadilla | PUR | Left | Left | 6' 2" | 200 lbs | - |
| Murdoch, Phil | SP | Free Agent | 30 | 06/17/2011 | Coram | USA | Switch | Right | 6' 3" | 200 lbs | - |
| Myers, Joe | LF | Tacoma Rainiers | 27 | 02/09/2015 | Kingston | CAN | Left | Right | 6' 3" | 200 lbs | - |
| Myers, Ricky | 2B | Free Agent | 31 | 01/28/2011 | Plano | USA | Right | Right | 6' 0" | 190 lbs | - |
