Because he underwent Tommy John surgery as a member of the Blue Jays on Oct. 1, Giles will not be able to help the Mariners in 2021. However, if his recovery goes well, Giles’ history suggests he will emerge as a valuable part of the Mariners’ bullpen the next season. Giles, after all, has logged a 2.74 ERA/2.57 SIERA with well-above-average strikeout and walk rates (33.3 and 7.7 percent, respectively) across a combined 351 innings with the Phillies, Astros and Jays. The 30-year-old right-hander has also converted 115 of 130 save attempts and averaged better than 97 mph on his fastball.
Giles’ elbow issues limited him to 3 2/3 frames last year, but it would be difficult to find many relievers who were harder to face in 2019. That season, Giles threw 53 innings of 1.87 ERA/2.49 SIERA ball and ended up sixth among bullpen arms in K-BB percentage (31.7).