Cardinals' Trevor Rosenthal to undergo Tommy John surgery

St. Louis Cardinals reliever Trevor Rosenthal will undergo Tommy John surgery next week.

What It Means:

Rosenthal injured his right elbow on August 16. The 27-year-old right-hander will be on the shelf until at least next September. Seung Hwan Oh is the likely favorite for ninth-inning work in St. Louis moving forward, but he was replaced by Tyler Lyons in the eighth inning on Wednesday after allowing a single and a triple. John Brebbia could also be an option for the Cardinals.

Rosenthal turned in a 3.40 ERA (2.53 xFIP) and 1.20 WHIP over 50 appearances and 47 2/3 innings in 2017 while posting a career-best 37.6 percent strikeout rate. He was 11-for-13 on save opportunities.