The Detroit Tigers have announced that Casey Mize will undergo Tommy John surgery.

Mize was the top pick in the 2018 draft.

The 25-year-old has been on the injured list with a right elbow sprain since April 15 after making two starts this season.

Mize's ulnar collateral ligament in his elbow is still intact, but Dr. Keith Meister determined the ligament had stretched to the point where it had lost elasticity and functionality.