The Seattle Mariners rolled into Fenway Park and walked out with an emphatic 8-3 victory over the Boston Red Sox on Wednesday, September 2, 2026. Patrick Sandoval lasted just four innings and Brayan Bello was roughed up out of the bullpen, leaving Boston's pitching staff to absorb a five-run beating that was never really in doubt after the middle innings. Roman Anthony's solo home run provided a highlight, but three runs simply weren't enough against a Mariners offense that found openings all night.

Red Sox Pitching Falters as Mariners Build Early Advantage

Sandoval, making the start, was charged with the loss after a rough four innings. He allowed five hits, walked three batters, and surrendered three earned runs before the Red Sox turned to the bullpen. Bello followed and pitched three innings — but those innings cost Boston dearly. He gave up seven hits, walked two, and allowed four more earned runs without recording a single strikeout. By the time Bello exited, the Mariners had built an insurmountable lead.

The one bright spot on the mound was Raymond Burgos, who closed out the final two innings with a dominant line: two scoreless innings, three strikeouts, and no hits or walks allowed. That kind of performance out of the bullpen matters — it just came far too late to change anything.

Roman Anthony, Wilyer Abreu, and Mickey Gasper Provide Offense but Fall Short

Boston's offense wasn't completely absent. Anthony went 3-for-5 with a home run and an RBI, showing the kind of at-bats you want to see from the young outfielder. Wilyer Abreu also went 3-for-4, giving the Sox two multi-hit performers in the outfield. Mickey Gasper added two hits of his own in five at-bats. The problem: all that contact produced just three runs total, and none of it came at moments that threatened Seattle's lead.

Key Offensive Performances — Boston Red Sox

  • Roman Anthony: 3-for-5, 1 HR, 1 RBI
  • Wilyer Abreu: 3-for-4, 0 RBI
  • Mickey Gasper: 2-for-5, 0 RBI

Mariners' Lineup Does Damage Across the Board

Seattle spread the offense around. J.P. Crawford went 3-for-3, working the count and getting on base all night. Julio Rodríguez went 2-for-5 with an RBI. Jhonny Pereda added two hits and drove in two runs in just three at-bats, making the most of his opportunities. Weston Wilson also posted two hits. It wasn't one player who beat Boston — it was a lineup that kept putting up crooked numbers.

Key Offensive Performances — Seattle Mariners

  • J.P. Crawford: 3-for-3, 0 RBI
  • Julio Rodríguez: 2-for-5, 1 RBI
  • Jhonny Pereda: 2-for-3, 2 RBI
  • Weston Wilson: 2-for-4, 0 RBI

Turning Point: Bello's Three-Inning Stretch Breaks the Game Open

If Sandoval's four-inning, three-run outing kept Boston within striking distance, Bello's appearance erased any hope of a comeback. Seven hits and four earned runs over three innings sent the deficit past the point of recovery. The Red Sox bats could not manufacture enough offense against Mariners starter Bryce Miller, who held Boston to one earned run over 4.2 innings while striking out three. Once Miller exited, the game was already effectively decided. Cooper Criswell picked up the win for Seattle after a scoreless final inning — a formality by that point.

What's Next for the Red Sox

Boston will need to regroup quickly. The pitching performance on Wednesday — seven earned runs allowed across the first seven innings — is the kind of game that demands answers. Bello in particular will need to be sharper. Anthony, Abreu, and Gasper showed Boston's lineup can generate hits, but the Red Sox will need run production to match in the next series if they want to string together wins this September.