Colorado Rockies right-handed reliever Scott Oberg had surgery Thursday to remove blood clots in his pitching elbow.
The procedure was performed at the Mayo Clinic in Scottsdale, Arizona. There's no timetable for his return.
This marks the fourth time he has dealt with blood clots in his career. He was optimistic the issue was under control after undergoing thoracic outlet surgery last September.
It's a big blow to the Colorado bullpen. Oberg pitched four innings this spring without allowing a run.
Oberg, who turned 31 on March 13, was steadily working his way back to the mound after missing all of the 2020 pandemic-shortened season due to a blood clot.