Deolis Guerra has elected to undergo surgery after receiving a second opinion on his right forearm.
It’s unclear exactly how long he’ll be sidelined, but Guerra is headed to the injured list to open the regular season. The 32-year-old righty reliever has been dealing with forearm tightness this spring. He emerged as a key piece of the Athletics’ bullpen last year, compiling a solid 4.11 ERA, 1.11 WHIP, and 62/20 K/BB ratio across 65 2/3 innings.