Günthardt won five singles titles during his professional career, including the Rotterdam WCT in 1980. The right-hander reached his career-high ATP singles ranking of world No. 22 in April 1986
American ATP Tennis star. He was briefly linked with actress Minnie Driver. On February 22, 2007, Robby participated on Spike TV's Pros vs. Joes with Rik Smits, Rob Dibble, and Andre Rison