These are the 2021 Opening Day rosters and Top 30 prospects for the Seattle Mariners. MLB The Show 21 Opening Day rosters coming when the game releases later in April!
| Opening Day Roster – Seattle Mariners | ||||||
| Position | Last Name | First Name | Age | Level | Potential | OVR |
| SP | Gonzales | Marco | 29 | MLB | ||
| SP | Kikuchi | Yusei | 29 | MLB | ||
| SP | Flexen | Chris | 26 | MLB | ||
| SP | Sheffield | Justus | 24 | MLB | ||
| SP | Paxton | James | 32 | MLB | ||
| SP | Dunn | Justin | 25 | MLB | ||
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| Position | Last Name | First Name | Age | Level | Potential | OVR |
| RP | Graveman | Kendall | 30 | MLB | ||
| RP | Misiewicz | Anthony | 26 | MLB | ||
| RP | Sadler | Casey | 30 | MLB | ||
| RP | Middleton | Kenyan | 27 | MLB | ||
| RP | Steckenrider | Drew | 30 | MLB | ||
| RP | Vest | Will | 25 | MLB | ||
| RP | Margevicius | Nick | 24 | MLB | ||
| RP | Munoz | Andres | 22 | A (INJ) | ||
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| Position | Last Name | First Name | Age | Level | Potential | OVR |
| CL | Montero | Rafael | 30 | MLB | ||
| CL | Giles | Ken | 30 | A (INJ) | ||
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| Position | Last Name | First Name | Age | Level | Potential | OVR |
| C | Murphy | Tom | 30 | MLB | ||
| C | Torrens | Luis | 24 | MLB | ||
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| Position | Last Name | First Name | Age | Level | Potential | OVR |
| 1B | White | Evan | 24 | MLB | ||
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| Position | Last Name | First Name | Age | Level | Potential | OVR |
| 2B | Moore | Dylan | 28 | MLB | ||
| 2B | France | Ty | 26 | MLB | ||
| 2B | Long Jr. | Shed | 25 | A (INJ) | ||
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| Position | Last Name | First Name | Age | Level | Potential | OVR |
| 3B | Seager | Kyle | 33 | MLB | ||
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| Position | Last Name | First Name | Age | Level | Potential | OVR |
| SS | Crawford | JP | 26 | MLB | ||
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| Position | Last Name | First Name | Age | Level | Potential | OVR |
| LF | Fraley | Jake | 25 | MLB | ||
| LF | Marmolejos | Jose | 28 | MLB | ||
| LF | Haggerty | Sam | 26 | MLB | ||
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| Position | Last Name | First Name | Age | Level | Potential | OVR |
| CF | Trammell | Taylor | 23 | MLB | ||
| CF | Lewis | Kyle | 25 | A (INJ) | ||
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| Position | Last Name | First Name | Age | Level | Potential | OVR |
| RF | Haniger | Mitch | 30 | MLB | ||
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| Seattle Mariners Top 30 Prospects via http://www.mlb.com | ||||||
| Rank | Last Name | First Name | Position | In Game? | Potential | OVR |
| 1 | Kelenic | Jarred | CF | Yes | A | 73 |
| 2 | Rodriguez | Julio | RF | Yes | A | 63 |
| 3 | Hancock | Emerson | RHP | CAP | A | 64 |
| 4 | Gilbert | Logan | RHP | Yes | B | 65 |
| 5 | Kirby | George | RHP | Yes | B | 63 |
| 6 | Trammell | Taylor | LF | Yes | B | 62 |
| 7 | Marte | Noelvi | 3B | Yes | A | 67 |
| 8 | Raleigh | Cal | C | Yes | B | 60 |
| 9 | Then | Juan | RHP | Yes | C | 61 |
| 10 | Williamson | Brandon | LHP | CAP | B | 62 |
| 11 | Phillips | Connor | RHP | CAP | C | 52 |
| 12 | Campbell | Isaiah | RHP | Yes | B | 66 |
| 13 | DeLoach | Zach | RF | CAP | C | 59 |
| 14 | Stoudt | Levi | RHP | CAP | B | 60 |
| 15 | Macko | Adam | LHP | CAP | C | 52 |
| 16 | Perez | Milkar | 3B | CAP | B | 57 |
| 17 | Rodriguez | Alberto | LF | CAP | C | 57 |
| 18 | Fletcher | Aaron | LHP | Yes | C | 66 |
| 19 | Shenton | Austin | 3B | CAP | C | 59 |
| 20 | Clase | Jonatan | CF | CAP | B | 55 |
| 21 | Fraley | Jake | CF | Yes | B | 70 |
| 22 | Mills | Wyatt | RHP | Yes | C | 56 |
| 23 | Adcock | Ty | RHP | CAP | B | 59 |
| 24 | Delaplane | Sam | RHP | Yes | D | 69 |
| 25 | Carlson | Sam | RHP | No | N/A | N/A |
| 26 | Polcovich | Kaden | 2B | CAP | C | 56 |
| 27 | Elliott | Tim | RHP | No | N/A | N/A |
| 28 | Rinehart | Logan | RHP | No | N/A | N/A |
| 29 | Keenan | Tyler | 1B | CAP | C | 58 |
| 30 | Brash | Matt | RHP | No | N/A | N/A |
| N/A | Feliz | George | CF | CAP | D | 53 |
| N/A | Bins | Carter | C | CAP | D | 55 |
| N/A | Marlowe | Cade | LF | CAP | D | 50 |
| N/A | Rosa | Joseph | 2B | CAP | D | 57 |
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