| 2021 Schedule For SYI | ||
| Month | Game | Matchup |
| March | 1 | GGG at SYI |
| March | 2 | GGG at SYI |
| March | 3 | GGG at SYI |
| March | OFF | |
| March | 4 | SYI at BUR |
| March | 5 | SYI at BUR |
| March | 6 | SYI at BUR |
| March | 7 | SYI at AAR |
| March | 8 | SYI at AAR |
| March | 9 | SYI at AAR |
| March | 10 | SRD at SYI |
| March | 11 | SRD at SYI |
| March | 12 | SRD at SYI |
| March | OFF | |
| March | 13 | CRC at SYI |
| March | 14 | CRC at SYI |
| March | 15 | CRC at SYI |
| March | 16 | SYI at HOH |
| March | 17 | SYI at HOH |
| March | 18 | SYI at HOH |
| March | 19 | CHI at SYI |
| March | 20 | CHI at SYI |
| March | 21 | CHI at SYI |
| April | 1 | SYI at DUB |
| April | 2 | SYI at DUB |
| April | 3 | SYI at DUB |
| April | OFF | |
| April | 4 | SYI at HMA |
| April | 5 | SYI at HMA |
| April | 6 | SYI at HMA |
| April | 7 | TAM at SYI |
| April | 8 | TAM at SYI |
| April | 9 | TAM at SYI |
| April | 10 | CAL at SYI |
| April | 11 | CAL at SYI |
| April | 12 | CAL at SYI |
| April | OFF | |
| April | 13 | SYI at OAK |
| April | 14 | SYI at OAK |
| April | 15 | SYI at OAK |
| April | 16 | SYI at GGG |
| April | 17 | SYI at GGG |
| April | 18 | SYI at GGG |
| April | 19 | BUR at SYI |
| April | 20 | BUR at SYI |
| April | 21 | BUR at SYI |
| May | 1 | AAR at SYI |
| May | 2 | AAR at SYI |
| May | 3 | AAR at SYI |
| May | OFF | |
| May | 4 | * SYI at HUC |
| May | 5 | * SYI at HUC |
| May | 6 | * SYI at HUC |
| May | 7 | * SYI at HUC |
| May | 8 | * SYI at HUC |
| May | 9 | * COL at SYI |
| May | 10 | * COL at SYI |
| May | 11 | * COL at SYI |
| May | 12 | * COL at SYI |
| May | OFF | |
| May | 13 | * WRK at SYI |
| May | 14 | * WRK at SYI |
| May | 15 | * WRK at SYI |
| May | 16 | * WRK at SYI |
| May | 17 | * WRK at SYI |
| May | 18 | * SYI at COL |
| May | 19 | * SYI at COL |
| May | 20 | * SYI at COL |
| May | 21 | * SYI at COL |
| May | OFF | |
| May | 22 | SYI at SRD |
| May | 23 | SYI at SRD |
| May | 24 | SYI at SRD |
| June | 1 | SYI at CRC |
| June | 2 | SYI at CRC |
| June | 3 | SYI at CRC |
| June | 4 | HOH at SYI |
| June | 5 | HOH at SYI |
| June | 6 | HOH at SYI |
| June | OFF | |
| June | 7 | * HUC at SYI |
| June | 8 | * HUC at SYI |
| June | 9 | * HUC at SYI |
| June | 10 | * HUC at SYI |
| June | 11 | * HUC at SYI |
| June | 12 | * SYI at VRN |
| June | 13 | * SYI at VRN |
| June | 14 | * SYI at VRN |
| June | 15 | * SYI at VRN |
| June | OFF | |
| June | 16 | NYY at SYI |
| June | 17 | NYY at SYI |
| June | 18 | NYY at SYI |
| June | 19 | CUB at SYI |
| June | 20 | CUB at SYI |
| June | 21 | CUB at SYI |
| June | 22 | SYI at DYE |
| June | 23 | SYI at DYE |
| June | 24 | SYI at DYE |
| All Star Break | OFF | |
| All Star Break | OFF | |
| All Star Break | OFF | |
| July | 1 | SYI at CHI |
| July | 2 | SYI at CHI |
| July | 3 | SYI at CHI |
| July | 4 | DUB at SYI |
| July | 5 | DUB at SYI |
| July | 6 | DUB at SYI |
| July | OFF | |
| July | 7 | * SYI at COL |
| July | 8 | * SYI at COL |
| July | 9 | * SYI at COL |
| July | 10 | * SYI at COL |
| July | 11 | * SYI at COL |
| July | 12 | * HUC at SYI |
| July | 13 | * HUC at SYI |
| July | 14 | * HUC at SYI |
| July | 15 | * HUC at SYI |
| July | OFF | |
| July | 16 | * SYI at WRK |
| July | 17 | * SYI at WRK |
| July | 18 | * SYI at WRK |
| July | 19 | * SYI at WRK |
| July | 20 | * SYI at WRK |
| July | 21 | * VRN at SYI |
| July | 22 | * VRN at SYI |
| July | 23 | * VRN at SYI |
| July | 24 | * VRN at SYI |
| Trade Deadline | OFF | |
| August | 1 | HMA at SYI |
| August | 2 | HMA at SYI |
| August | 3 | HMA at SYI |
| August | 4 | SYI at TAM |
| August | 5 | SYI at TAM |
| August | 6 | SYI at TAM |
| August | OFF | |
| August | 7 | * COL at SYI |
| August | 8 | * COL at SYI |
| August | 9 | * COL at SYI |
| August | 10 | * COL at SYI |
| August | 11 | * COL at SYI |
| August | 12 | * SYI at WRK |
| August | 13 | * SYI at WRK |
| August | 14 | * SYI at WRK |
| August | 15 | * SYI at WRK |
| August | OFF | |
| August | 16 | * VRN at SYI |
| August | 17 | * VRN at SYI |
| August | 18 | * VRN at SYI |
| August | 19 | * VRN at SYI |
| August | 20 | * VRN at SYI |
| August | 21 | * SYI at HUC |
| August | 22 | * SYI at HUC |
| August | 23 | * SYI at HUC |
| August | 24 | * SYI at HUC |
| September | 1 | SYI at CAL |
| September | 2 | SYI at CAL |
| September | 3 | SYI at CAL |
| September | 4 | OAK at SYI |
| September | 5 | OAK at SYI |
| September | 6 | OAK at SYI |
| September | OFF | |
| September | 7 | SYI at NYY |
| September | 8 | SYI at NYY |
| September | 9 | SYI at NYY |
| September | 10 | SYI at CUB |
| September | 11 | SYI at CUB |
| September | 12 | SYI at CUB |
| September | 13 | DYE at SYI |
| September | 14 | DYE at SYI |
| September | 15 | DYE at SYI |
| September | OFF | |
| September | 16 | * SYI at VRN |
| September | 17 | * SYI at VRN |
| September | 18 | * SYI at VRN |
| September | 19 | * SYI at VRN |
| September | 20 | * SYI at VRN |
| September | 21 | * WRK at SYI |
| September | 22 | * WRK at SYI |
| September | 23 | * WRK at SYI |
| September | 24 | * WRK at SYI |