Funk graduated from the University of Maryland, College Park in 1980 and turned professional in 1981, but he worked as a golf coach at his former university from 1982 to 1988, and did not become a member of the PGA Tour until 1989.

He picked up a number of wins from 1992 onwards, and without quite becoming one of the top stars on the tour, did well enough to reach the top 20 on the career money list.

He was a member of the United States teams at the 2003 and 2005 Presidents Cup and the 2004 Ryder Cup. On March 28, 2005 he picked up the biggest win of his career, becoming the oldest player ever to win The Players Championship as well as the Skins Game, during which, to satisfy a friendly bet, he famously wore a pink skirt Annika Sorenstam pulled out of her golf bag when she outdrove Funk on one of the holes. 

His professional wins invclude:1992 Shell Houston Open, 1995 Ideon Classic at Pleasant Valley, Buick Challenge, 1996 B.C. Open, 1998 Deposit Guaranty Golf Classic and 2004 Southern Farm Bureau Classic.

On June 8, 2009 Funk became the oldest qualifier, at age 53, for the U.S. Open.