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.
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.
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.
Boston is without Garrett Crochet and Roman Anthony, leaving veteran first baseman Willson Contreras to lead their offense with 16 home runs.
