Bosio attended Cordova High School in Rancho Cordova, California, and Sacramento City College. He was first drafted by the Pittsburgh Pirates in the 29th round of the 1981 MLB draft, but he did not sign. The Milwaukee Brewers subsequently selected him in the second round of the 1982 MLB draft\'s secondary phase, held in January; he signed with the Brewers in June 1982.\n', '

Bosio played in Milwaukee\'s farm system for the 1982 through 1985 seasons, and partially during 1986, the year of his MLB debut. After playing for Rookie League and Class A teams through 1984, Bosio spent 1985 with the Double-A El Paso Diablos, compiling an 11–6 record in 28 games (25 starts). In 1986, he spent most of the season with the Triple-A Vancouver Canadians, appearing in 44 games (all in relief); he had a 7–3 record with a 2.28 ERA in 67 innings pitched.\n', '

Bosio made his MLB debut on August 3, 1986, against the Texas Rangers. He pitched three innings in relief, giving up three hits and one run, with one strikeout, Pete Incaviglia. He made a total of 10 appearances (four starts) with the 1986 Brewers, with a 7.01 ERA and an 0–4 record.\n', '

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