Seattle Mariners Bullpen Shakeup: Carson Fulmer Trade & Cooper Criswell Injury Update (2026)

The Seattle Mariners have made some intriguing moves in their bullpen, with a reported trade and some strategic roster adjustments. The team's recent actions highlight their commitment to bolstering their relief corps and addressing specific needs. Here's a breakdown of these moves and their implications.

The Trade: Carson Fulmer to the Mariners

The acquisition of right-hander Carson Fulmer from the Pittsburgh Pirates is a notable addition to the Mariners' bullpen. Fulmer, 32, has been a journeyman pitcher, spending time with the Chicago White Sox, Detroit Tigers, Baltimore Orioles, Cincinnati Reds, and Los Angeles Angels. His career ERA of 5.44 over 256 2/3 innings is a testament to his resilience, but his recent performance in Triple-A with the Indianapolis Indians (6.35 ERA, 1.65 WHIP) suggests a need for a fresh start.

What makes this trade particularly interesting is the fact that Fulmer was not on Pittsburgh's 40-man roster, indicating that the Pirates may have seen him as a trade chip. For the Mariners, this move provides a veteran presence in the bullpen, offering both experience and a different look against right-handed batters. However, with a 6.35 ERA, there are concerns about his effectiveness, especially given the Mariners' recent struggles with right-handed batters.

Cooper Criswell's Injury and Nick Davila's Recall

The Mariners' bullpen took a hit with the news of Cooper Criswell's right shoulder strain, which landed him on the 15-day injured list. Criswell, 29, has been a reliable arm in his first year with the team, boasting a 3.52 ERA in 30 2/3 innings over 26 appearances. His absence will be felt, particularly given his recent struggles in back-to-back outings, where he surrendered two runs without recording an out on Sunday and one run over 1 1/3 innings on Monday.

To fill the void, the Mariners recalled right-hander Nick Davila from Triple-A Tacoma. Davila, 27, made his major league debut earlier this season, pitching 7 1/3 scoreless innings with four strikeouts and six walks. His ability to pitch scoreless innings is a positive sign, but the six walks are a concern, indicating a need for better control.

Implications and Future Outlook

These moves reflect the Mariners' strategic approach to managing their bullpen. By acquiring Fulmer, they gain a veteran presence, but his recent performance raises questions about his effectiveness. The team's decision to recall Davila suggests a belief in his potential, despite the need for better control. Meanwhile, Criswell's injury serves as a reminder of the importance of depth and the potential risks associated with relying on a small group of pitchers.

As the season progresses, the Mariners will need to carefully manage their bullpen, ensuring that they have the right mix of experienced and developing talent. The recent trades and roster adjustments provide an opportunity for the team to reassess their strategy and make further moves to strengthen their position in the highly competitive American League West.

Seattle Mariners Bullpen Shakeup: Carson Fulmer Trade & Cooper Criswell Injury Update (2026)

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