The American League West-leading Seattle Mariners begin a three-game series against the Boston Red Sox on Friday, June 19, 2026, at T-Mobile Park.
The matchup highlights two contrasting pitching strategies, with Seattle employing a unique tandem approach.
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Seattle enters with a 39-37 record, while Boston arrives on a four-game losing streak at 29-43.
The Red Sox were swept at home by the Toronto Blue Jays, going 1-for-29 with runners in scoring position.
Pitching Matchups
To manage their six-man rotation ahead of the All-Star break, the Mariners reintroduce a piggyback system.
Right-hander Bryce Miller (3-0, 1.54 ERA) will start the opener before handing the ball to fellow starter Luis Castillo in relief.
Boston counters with left-handed pitcher Ranger Suarez, who carries a 3.21 ERA.
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Game 2 on Saturday features Seattle's Emerson Hancock against Boston's Connelly Early.
Game 3 on Sunday sees Logan Gilbert face Payton Tolle.
Roster Moves and Injuries
The Mariners signed right-handed batter Weston Wilson and designated Miles Mastrobuoni for assignment to add right-handed depth against Boston's left-handed starters.
Boston scratched second baseman Isiah Kiner-Falefa due to forearm soreness, moving Caleb Durbin up and inserting shortstop Marcelo Mayer, who recovered from illness.
Seattle outfielder Julio Rodriguez remains day-to-day with a minor hamstring injury, while catcher Cal Raleigh recently returned from the injured list.
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Boston is without Garrett Crochet and Roman Anthony, leaving veteran first baseman Willson Contreras to lead their offense with 16 home runs.
