The Seattle Mariners received an encouraging boost to their pitching staff on Wednesday as starting pitcher officially returned to the rotation for his first appearance of the 2026 season. The 27-year-old right-hander delivered a strong outing in his long-awaited return, giving Seattle optimism that he can once again become a reliable part of the club’s starting staff.
Miller entered 2026 looking to rebound after an injury-plagued 2025 campaign. In 2024, he had established himself as one of the Mariners’ most dependable starters, making 31 starts while posting an impressive 2.94 ERA over 180.1 innings pitched. However, injuries disrupted his momentum the following season, limiting him to only 18 starts and contributing to a difficult year in which his ERA rose to 5.68.
Despite those struggles, Miller showed flashes of his potential late in the year during the postseason. Across three playoff starts, he recorded a 2.51 ERA in 14 innings while helping Seattle remain competitive. Those performances gave both Miller and the organization confidence heading into the offseason.
Unfortunately for Miller, health issues surfaced again during spring training in 2026. A left oblique strain forced him to miss all of April and delayed his regular-season debut. Before returning to the majors, Miller completed a rehabilitation assignment that included appearances with High-A Everett and Triple-A Tacoma. During four rehab outings, he allowed only three earned runs across 13.2 innings, signaling that he was ready to rejoin Seattle’s rotation.
The Mariners officially activated Miller on May 13, making room for him on the roster by designating left-handed reliever José Suárez for assignment.
Once back on the mound, Miller quickly reminded the team why he remains such a valuable arm. Facing the Houston Astros, he settled in early and navigated through the opening inning with minimal trouble, allowing only a single to Yordan Alvarez.
The second inning presented a challenge after Zach Dezenzo opened with a double, but Miller calmly worked out of danger and stranded the runner. He followed that with a clean third inning before running into more traffic in the fourth. With runners aboard, Miller recorded his first strikeouts of the season by retiring Dezenzo and Braden Shewmake to end the threat.
The toughest moment of Miller’s outing came in the fifth inning. The Astros loaded the bases after a pair of singles and a sacrifice bunt, putting significant pressure on the Mariners starter. Miller responded with a key strikeout of Jose Altuve before inducing a pop out from Isaac Paredes to escape the jam without surrendering a run.
Houston finally broke through in the sixth inning when Christian Walker launched a solo home run. Miller later allowed additional baserunners before exiting the game after 5.1 innings. He finished with two earned runs allowed while showing flashes of the form Seattle hoped to see.
Although the Mariners ultimately lost 4-3 in extra innings, Miller’s performance was viewed as a positive step forward. He kept Seattle competitive and demonstrated that he can still be a key contributor in the rotation.
His return also creates an interesting situation for the Mariners pitching staff. Emerson Hancock filled Miller’s spot earlier in the season and has pitched effectively with a 3.21 ERA through eight starts. Seattle must now decide whether Hancock shifts into a long-relief role, whether veteran Luis Castillo could see bullpen work, or if the club chooses to implement a six-man rotation to help keep its pitchers healthy throughout the season.
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