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In July 2020, more than 22 months removed from his first ulnar collateral ligament reconstruction as a rookie in 2018, Ohtani took the mound at Oakland Coliseum and failed to record an out, instead giving up five runs to the Athletics on three hits and three walks before being removed after 30 ineffective pitches.

Jefferies previously had the ulnar collateral ligament reconstruction in 2017.

Diamondbacks: RHP Chris Devenski is out for the season after having ulnar collateral ligament reconstruction surgery on his elbow.

He is widely known for undergoing the groundbreaking ulnar collateral ligament reconstruction surgery on his left elbow in 1974 that bears his name.

The revolutionary ulnar collateral ligament reconstruction allowed John to win an additional 164 games, more than half of his career total of 288 victories.