Australia’s No.1 junior in 1970, Warwick was runner-up at the 1980 Australian Open to American Brian Teacher, losing the final 5-7 6-7 2-6.

He won three singles titles Bangalore 1976, Adelaide 1979 and Johannesburg 1980.

But it was in doubles that he excelled, winning 26 titles including three Australian Opens 1978 (w/Wojtek Fibak, POL), Australian Open 1980 and 1981 (w/Mark Edmondson, AUS) and French Open 1985 (w/Edmondson).

In mixed doubles he won the 1972 French Open (w/Evonne Goolagong Cawley, AUS) and the 1976 French Open (w/Ilana Koss).

He was ranked No.15 in singles (1981) and No.10 in doubles (1985).

Warwick now runs a tennis academy in Hornsby, Sydney.