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The MLB regular season game between Boston Red Sox and Seattle Mariners is scheduled for June 21, 2026, at T-Mobile Park in Seattle, WA. Broadcasted on NESN, this matchup features a retractable dome venue. Our picks favor Boston with a predicted score of 3.35 against Seattle's 4.06, suggesting a tight contest. Boston has a 59.4% probability of covering the +1.5 spread, while Seattle's chance to cover -1.5 is 40.6%. Recent prediction results show a strong hit rate in point spread markets, enhancing the reliability of these betting tips. For more detailed analysis, visit our MLB picks page.
![]() DETF. Valdez (L) 33-44100% +120Everygame | |||||||
TBD. Rasmussen (R) 43-310% -185BetOnline | |||||||
MIAT. Phillips (R) 40-3825% -121BetOnline | |||||||
WSHF. Griffin (L) 40-38- -111MyBookie | |||||||
![]() TORS. Bieber (R) 38-39- -116BetOnline | |||||||
CINB. Singer (R) 37-3987% +145Everygame | |||||||
NYMK. Senga (R) 34-43100% +110Everygame | |||||||
![]() CWSA. Kay (L) 39-3725% +105Everygame | |||||||
![]() MINZ. Matthews (R) 38-41100% +140Everygame | |||||||
STLA. Pallante (R) 41-3440% -138BetOnline | |||||||
![]() COLR. Feltner (R) 30-48100% +115Everygame | |||||||
LAAS. Aldegheri (L) 32-4750% +150Everygame | |||||||
![]() SDM. King (R) 39-37- -102BetOnline |