The Seattle Mariners welcome the Toronto Blue Jays to T-Mobile Park on Friday, July 3, 2026, for a weekend series that renews last year's American League Championship Series rivalry.
Toronto won that seven-game ALCS en route to the World Series.
Seattle enters with a 45-43 record after sweeping the Los Angeles Angels, pushing them above . 500.
Toronto arrives at 41-46, coming off a nine-run victory on Canada Day.
The Mariners will be without star center fielder Julio Rodriguez, placed on the 7-day concussion injured list after taking an errant throw to the head.
Victor Robles replaces him in center field, returning from a forearm hit-by-pitch. Miles Mastrobouni joins the active roster as Cooper Criswell moves to the 60-day injured list.
Luis Castillo (3-6, 4.93 ERA) starts for Seattle.
The Mariners lead the American League in starting pitching (86 FIP-) and rank second in bullpen performance (88 FIP-).
Toronto counters with ace Dylan Cease, who signed a seven-year, $210 million contract in the offseason.
Cease (4-4, 3.02 ERA) leads the AL with 128 strikeouts over 83.1 innings and is a Cy Young contender.
The Blue Jays lineup features rookie Sean Keys, who hit a three-run homer on Canada Day, and Kazuma Okamoto, who has 19 home runs this season.
Toronto has 10 players on the injured list, contributing to a lower team batting metric compared to Seattle's 102 wRC+.
