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Prospect Michael Kopech, the 19-year-old righthander who suffered a broken bone in a fight with his teammate, underwent a procedure in Boston on Tuesday to insert a screw into his right hand to stabilize the fracture, according to a major league source.

He’s expected to be sidelined for approximately six weeks before he can start preparing for the season, meaning that the earliest he would pitch for a Red Sox minor league affiliate would be mid- to late-May.

That lost time follows a 2015 season in which the 2014 first-rounder — considered the team’s second-best pitching prospect — was limited to 65 innings with Single A Greenville because of a 50-game suspension due to a positive test for a banned stimulant. In 2015, Kopech went 4-5 with a 2.63 ERA, 70 strikeouts, and 27 walks in 65 innings, featuring an arsenal that was headlined by a fastball that reached triple digits.


Alex Speier can be reached at alex.speier@globe.com. Follow him on twitter at @alexspeier.