PHOENIX -- His plans of avoiding the procedure through rest and rehab having failed, D-backs left-handed relief pitcher Matt Reynolds will undergo Tommy John surgery on Sept. 24 to repair a tear of his ulnar collateral ligament.
Reynolds, who first sustained the injury in June, had been close to making a return to the D-backs' bullpen this month when discomfort in the elbow forced him to abruptly end a simulated game on Thursday.
The 28-year-old then underwent an MRI exam to assess the damage before meeting with team doctors on Monday night and determining that surgery would be necessary.
Reynolds was one of the D-backs' most reliable relievers in 2013, posting a 1.98 ERA in 27 1/3 innings while striking out 23 batters.
Tyler Emerick is an associate reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.