An overpowering right-handed pitcher, Martz was drafted by the Chicago Cubs in 1977 after being named the Most Valuable College Player in the nation. That year, he had 14 wins and no losses for the University of South Carolina. His team advanced to the final game of the 1977 College World Series, but lost to Arizona State by the score of 2-1. Martz was named a First Team All-American. After playing several years in the Cubs farm system, he made his Major League debut in 1980 at the age of 24. He remained with the Cubs through the 1982 season. In 1983, he pitched in the Major Leagues for the Chicago White Sox under manager Tony LaRussa and pitching coach Dave Duncan. Martz has been the head baseball coach at Lewis and Clark Community College since 1991. Jason Isringhausen was one of his players in the early 1990s. In 1996, the Lewis and Clark Trailblazers won the Region 24 Tournament and the District Championship. The Trailblazers finished third at the NJCAA national tournament in Millington, Tennessee. In 1997, the Trailblazers won the Region 24 Tournament again, but fell one game short of winning the District Championship. In 2012, Martz was inducted into the Lewis and Clark Sports Hall of Fame. From 1987 to 1990, he was the head baseball coach at MacMurray College in Jacksonville, Illinois. Martz has been the pitching coach for the Gateway Grizzlies since 2007. He was the manager of the River City Rascals from 2004 to 2006. He was the assistant coach of the Rascals from 2000 to 2003. Martz grew up in Harrisburg, Pennsylvania and played baseball, basketball, and football for Upper Dauphin High School. An outstanding quarterback, he received a football scholarship to the University of South Carolina. He is a member of the Harrisburg Hall of Fame. In 2014, Martz was inducted into the South Carolina Athletic Hall of Fame.