Tommy John surgery usually requires a year-long rehabilitation, but the success rate of the procedure is high. The Brewers used the 23-year-old Scarpetta's final Minor League option in March.
"The reason why I did have this surgery is I do think I will be in the big leagues at some point, and, to me, I needed to have the surgery to pitch at that level," Scarpetta told television station WIFR in Rockford, Ill., which first reported the news.
Scarpetta ranked No. 18 on MLB.com's list of the Top 20 Brewers prospects entering the season.
Scarpetta was Milwaukee's 11th-round Draft pick in 2007 and was immediately added to the 40-man roster because of an injury-related rules technicality. He is 21-28 with a 3.61 ERA in four Minor League seasons.