Vaughan turned professional in 1990. He played on the Nationwide Tour from 1992 to 1994, winning twice in 1994. He finished sixth on the money list in 1994 earning him his PGA Tour card for 1995. He struggled on the PGA Tour in 1995, making only 15 cuts in 30 events. He finished 173rd on the money list and lost his card. He played the Nationwide Tour again from 1996 to 1998. He also played the South African Tour for several seasons, winning the Autopage Mount Edgecombe Trophy in 1994 and finishing second on the 1993/94 Order of Merit.