Taijuan Walker Has Torn UCL, Requires Tommy John Surgery

On Tuesday, Diamondbacks manager Torey Lovullo announced Taijuan Walker had a UCL injury and would seek a second opinion in New York.

On Wednesday, Lovullo announced that injury is a tear and he will undergo Tommy John surgery.

Walker has a 4.02 earned run average in 170.1 innings in two years with Arizona.

Matt Koch will start in place of Walker on Friday.

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