Overview
- The signing was announced on Aug. 12 and the 32‑year‑old right‑hander has reported to the Mariners’ Triple‑A Tacoma Rainiers.
- Effross was released by Detroit’s Triple‑A Toledo club last week after making 27 appearances and allowing a 4.46 ERA in 36 1/3 innings.
- His recent Triple‑A numbers include a low strikeout rate (about 16% of batters) and a 42% ground‑ball rate, which raise questions about his ability to miss bats at the big‑league level.
- Effross’s comeback bid is shaped by a string of surgeries and injuries, including Tommy John surgery, back surgery and a left hamstring strain that have limited his continuity.
- The move gives Seattle a low‑risk option to fill the two to three middle‑relief spots created by recent bullpen underperformance and injuries and sets up competition that could lead to a promotion if Effross regains his form.