Tim won a total of four top-level singles titles and reached the quarter-finals of the 1979 Wimbledon Championships, beating Mike Cahill, Tomáš Šmíd, Cliff Letcher and John McEnroe in the fourth round, before losing to Roscoe Tanner.

After retiring from the professional tour in 1986, Gullikson continued to play tennis in seniors events, winning the 35-over singles title at Wimbledon in 1991.

He worked with several professional players, including Martina Navratilova, Mary Joe Fernández and Aaron Krickstein.

The seizures were mistakenly traced to a congenital heart problem after German neurologists discovered a blood clot in his brain in December 1994.

[2] Sampras went on to win 14 slams in his career, the remaining nine coming when Paul Annacone was his coach, Gullikson's successor.