 He and fellow minor leaguer John Evans were traded back to the A's for infielder Rob Picciolo at the start of the minor league season.Warren rewarded the A's with a breakout season for the Modesto A's in 1982, going 19-4 with a 3.00 ERA and 154 strikeouts to lead his team to the California League Championship.He made the jump from double A to the majors in 1983 thanks in part to a rash of injuries suffered by Oakland pitching.