[1] He defeated over 35 players ranked in the top ten including Guillermo Vilas, Raúl Ramírez, Vitas Gerulaitis, Jan Kodeš, Bob Lutz and Arthur Ashe.

Partnering with Evonne Goolagong, he won the French Open 1972, defeating Françoise Dürr and Jean-Claude Barclay in the final 6–2, 6–4.

Evonne and Kim were finalists in 1972 at Wimbledon against Rosie Casals and Ilie Năstase who won 6–4, 6–4.

Warwick also holds the record for the most match points missed in a losing effort, having held eleven chances to defeat eventual champion Adriano Panatta in the Rome Masters in 1976.

His record would later be surpassed by Ivan Lendl and Stefan Edberg, who would run it out to 54 consecutive Grand Slam appearances.