Moore made his Major League Baseball debut on April 11, 1982, and played his final game on August 31, 1995.[2] His career concluded with a regular season win–loss record of 161–176 with a 4.39 earned run average (ERA), 79 complete games, and 16 shutouts in 450 games pitched (2,831+2⁄3innings pitched).[2] Moore's finest season arguably came in 1989 with Oakland, when he set career bests with 19 wins, a 2.61 ERA and a .219 batting average against.[2] He was elected to the American League All-Star team that year and finished third in AL Cy Young Award voting.[3]
Moore played for the Athletics in two World Series. He was a member of the A's team that swept the San Francisco Giants in the 1989 World Series, starting and winning two of the four games, and hitting a double as well.[2] He was also on the A's team that lost to the Cincinnati Reds in the 1990 World Series. In five postseason series, Moore made seven career starts and compiled a 4–3 won-loss record with a 3.29 ERA.[2]