Highly regarded Twins prospect Lewis Thorpe has a torn UCL and will have Tommy John surgery at an undetermined date, LaVelle E. Neal III of the Minneapolis Star-Tribune tweets. Baseball Prospectus ranked Thorpe the No. 91 prospect in baseball last month, and MLB.com ranks Thorpe the No. 9 prospect in an excellent Twins system. His injury is simply the latest in an epidemic of arm problems leading to Tommy John surgery, with Yu Darvish and unsigned 2014 No. 1 overall draft pick Brady Aiken among the latest victims.

Thorpe pitched well against much older competition last year in the Midwest League, posting a 3.52 ERA with 10.0 K/9 and 4.5 BB/9 as an 18-year-old. The previous season, he racked up 64 strikeouts against six walks in 44 innings in the Gulf Coast League. MLB.com praised the velocity (in the low 90s) and movement on the young Australian’s fastball, noting that he also had a good changeup and was working on two breaking pitches.