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Mattson struggled in 2026 with a 5.35 ERA in 38 2/3 innings out of the bullpen, but the 31-year-old was much better for the Pirates in 2025, posting a 2.45 ERA, 1.13 WHIP, and 45/19 K/BB ratio in 47 2/3 innings. The Mariners will try to help him get back to that level of production.

It’s safe to assume that Mattson is probably done for the rest of the season with less than three weeks left. The 31-year-old has posted an underwhelming 5.35 ERA across 38 2/3 innings for the Pirates this season.

Mattson, who lost his spot after the Pirates rebuilt their pen at the trade deadline, has a 4.91 ERA in 36 2/3 innings this season.

A regular member of the Pirates’ bullpen churn, this is the fourth time Mattson has been sent down to Triple-A since May 20th. Just wait another week or two and it’s likely he comes back up when they need a fresh arm.

Mattson was only in Triple-A for 11 days. He’ll return to a 4.93 ERA, 1.56 WHIP, and a 33/16 K/BB ratio over 34 2/3 innings in 36 appearances with the Pirates this season.

With Camilo Doval set to join the Pirates’ bullpen on Sunday someone needed to get the boot and it looks like Mattson drew the short straw this time around. The 31-year-old right-hander holds a 4.93 ERA, 1.56 WHIP and a 33/16 K/BB ratio over 34 2/3 innings in 36 appearances with the Pirates this season.

Mattson augments Pittsburgh’s relief depth heading into a pair of contests against the division-rival Reds. The 31-year-old has posted a serviceable 4.93 ERA across 34 2/3 innings at the big-league level this season.

With no off day until August 10th, the Pirates are cycling through bullpen pitchers to ensure that they have some fresh arms ready to go. We should see Mattson back up this summer.

Mattson returns to Pittsburgh’s relief mix after spending nearly a month in the minors. The 30-year-old posted a serviceable 4.12 ERA, 1.47 WHIP and 15/10 K/BB ratio across 19 2/3 innings for the Pirates earlier this season. He’ll operate in middle relief situations.

Mattson isn’t pitching poorly, with a 4.12 ERA in 19 2/3 innings for the Pirates this season. However, the team wanted to get pitching prospect Wilber Dotel up in their bullpen, and Mattson is one of the few relievers with minor league options remaining.