Michael Warren Maroth (born August 17, 1977) is a former American Major League Baseball (MLB) starting pitcher. Born in Orlando, Florida, and after attending the University of Central Florida, the left-handed Maroth made his Major League debut in 2002 for the Detroit Tigers.
A third-round pick in the 1998 draft, Maroth spent his first two years of professional baseball playing for the Single-A Sarasota Red Sox in the Boston Red Sox organization. He led Sarasota's starting pitchers with 11 wins in 1999.
Before the 2000 season, Maroth was traded to the Tigers organization for relief pitcher Bryce Florie and worked his way up from the Single-A Lakeland Tigers to the Triple-A Toledo Mud Hens by 2001. Maroth had a 4.65 earned run average (ERA) with Toledo. At the time of his promotion to the Tigers, he was also tied for second place in wins for the entire International League. Maroth was made a starter for the Tigers on June 8, 2002.
In 2003, Maroth lost 21 games for the Tigers—the first pitcher to lose 20 or more games in a season since Brian Kingman lost 20 for the Oakland Athletics in 1980. However, he led the Tigers in wins (9) and win-loss percentage (.300) while the team set the American League record of 119 games lost (43–119).