SEATTLE -- Marco Gonzales was reinstated from the 10-day disabled list to start Tuesday night's series opener against the Padres at Safeco Field, while the club also promoted right-handed relievers Matt Festa and Nick Rumbelow as its final September callups.
Gonzales missed two starts with a cervical muscle strain in his neck, an issue that hindered his past few outings in a rough August. The 26-year-old lefty is 12-9 with a 4.32 ERA in 25 starts on the year, but he went 0-4 with a 10.35 ERA in four starts last month before going on the DL on Aug. 27.
Festa and Rumbelow were recalled from Double-A Arkansas after the Travelers finished their postseason run on Sunday with a loss in the final game of the Texas League Division Series.
Festa, the Mariners' No. 8 prospect per MLB Pipeline, will be making his third stint with Seattle. He pitched 2 2/3 innings in two prior outings, allowing one run and one walk. The 25-year-old rookie went 5-2 with 20 saves and a 2.76 ERA in 44 relief appearances for Arkansas, with 67 strikeouts and 12 walks, and he was named to the Texas League Postseason All-Star team.

Rumbelow has made nine appearances for the Mariners in four prior big league stints this year, posting a 6.75 ERA with nine strikeouts and three walks in 13 1/3 innings. He missed the first two months of the season with a nerve issue in his neck, and then he went 1-0 with two saves and a 2.04 ERA in 13 outings for Triple-A Tacoma before finishing with two scoreless innings in two outings with Arkansas.
With their latest additions, the Mariners now have 38 players on their active roster for the final 19 games of the season.