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| Name | Pos | Team | Age | DOB | POB | Nationality | Bats | Throws | Height | Weight | Salary |
|---|---|---|---|---|---|---|---|---|---|---|---|
| Raffone, Francis | SS | Asheville Highlanders | 28 | 02/11/2013 | Barquisimeto | VEN | Right | Right | 6' 1" | 195 lbs | - |
| Ramírez, Mario | 2B | Providence Pilgrims | 27 | 06/22/2014 | Pimentel | DOM | Right | Right | 6' 3" | 220 lbs | - |
| Ray, Frank | RF | Providence Pilgrims | 27 | 02/28/2014 | Lake Havasu City | USA | Right | Left | 6' 5" | 220 lbs | - |
| Rebola, Sallvador | CF | Ottawa Nationals | 27 | 01/08/2014 | Humaita | BRA | Right | Right | 6' 2" | 195 lbs | - |
| Reddaway, Ronald | SP | Ottawa Nationals | 22 | 01/09/2019 | Kingston | JAM | Right | Right | 6' 0" | 175 lbs | - |
| Reed, Reggie | SP | Athletic Club KC Academy | 24 | 09/30/2017 | Pacific | USA | Left | Left | 6' 0" | 200 lbs | - |
| Reid, Jerry | RP | Squirrel Hill Pierogis | 25 | 11/06/2016 | Myrtle Beach | USA | Left | Left | 6' 1" | 200 lbs | - |
| Reyes, Augusto | RF | Billings Polar Bears | 28 | 06/24/2013 | Sant Cugat del Vallès | ESP | Left | Left | 6' 5" | 220 lbs | - |
| Reyes, Iván | SS | Free Agent | 25 | 02/08/2016 | San Juan Sacatepéquez | GUA | Right | Right | 6' 5" | 200 lbs | - |
| Rivera, Ernesto | 1B | Richland Rails | 27 | 06/12/2014 | Cross Lanes | USA | Right | Right | 6' 1" | 195 lbs | - |
| Roberson, Steve | C | Billings Polar Bears | 25 | 09/20/2016 | New York | USA | Right | Right | 6' 4" | 220 lbs | - |
| Roberts, Scot | CF | Billings Polar Bears | 26 | 01/27/2015 | New Haven | USA | Right | Right | 6' 0" | 190 lbs | - |
| Roberts, Stu | SS | Squirrel Hill Pierogis | 21 | 09/19/2020 | Gaithersburg | USA | Right | Right | 6' 2" | 185 lbs | - |
| Robertson, Ryan | RP | Billings Polar Bears | 24 | 10/02/2017 | Watertown | USA | Right | Right | 6' 1" | 185 lbs | - |
| Rodríguez, Ken | C | Barton Springs Blues | 27 | 12/09/2014 | Harlingen | USA | Right | Right | 5' 11" | 205 lbs | - |
| Rodríguez, Leonardo | CF | Billings Polar Bears | 22 | 05/02/2019 | West Valley City | USA | Switch | Right | 6' 1" | 185 lbs | - |
| Rodríguez, Manuel | SP | Ottawa Nationals | 26 | 02/07/2015 | Paradise | USA | Right | Right | 5' 11" | 190 lbs | - |
| Roelofs, Alco | SP | Bethesda Atoms | 23 | 08/19/2018 | Willemstad | CUR | Right | Right | 6' 1" | 175 lbs | - |
| Romero, Rafael | RF | Barton Springs Blues | 28 | 09/20/2013 | Guatemala | GUA | Left | Left | 6' 1" | 225 lbs | - |
| Romo, Alfredo | SP | Marquette Miners | 23 | 02/03/2018 | San Luis Potosí | MEX | Right | Right | 6' 7" | 215 lbs | - |
| Rosário, Carlos | 1B | Billings Polar Bears | 25 | 09/06/2016 | Nagua | DOM | Left | Left | 6' 4" | 220 lbs | - |
| Ruffin, Lane | SS | Asheville Highlanders | 25 | 09/05/2016 | Ukiah | USA | Right | Right | 6' 1" | 190 lbs | - |
