Second round finishes at the tournaments in Hope Island and Sydney saw McQuillan's ranking drop 20 places. She was lost a tough match to Serna at the Australian Open 6-3 4-6 9-7. At Ameila Island, she defeated Schultz McCarthy to reach the round of 16. Along with her partner, McPherson, McQuillan reached the Mixed Doubles French Open Semi Finals. McQuillan led Zvereva 5-3 in the opening set, before losing a tight match 7-5 6-4 at Wimbledon. McQuillan came closer to beating Zvereva at the US Open falling 3-6 6-3 6-4.

McQuillan's highlight of the year was when she defeated 7 seeded Martinez at the US Open to reach the fourth round. She came back from 2-5 down in the 2nd set to win 6-2 7-5. She won the Bronx (satellite tournament) before the US Open. McQuillan reached the quarter final of Hope Island losing to top seed Likhovsetva 6-3 3-6 7-6. In Sydney, she defeated Schultz McCarthy 6-4 6-7 6-4 in the opening round. McQuillan won both her Fed Cup matches against South Africa including a 6-3 7-6 win over Coetzer. She had unlucky grass court draws, with Spirlea beating McQuillan 7-6 7-6 at Eastbourne and Seles beating McQuillan at Wimbledon. She lost to van Roost in the semi finals Quartar. McQuillan finished the year ranked 49.

McQuillan and her male partner, McPherson, came close to their first ever slam final losing to Raymond and Galbraith 3-6 6-3 6-4 in the Semi finals. She had close matches in her Australian campaign in Sydney where she lost to Schultz McCarthy 6-7 6-3 6-4 while at the Australian Open McQuillan lost to Rubin. Both Schultz McCarthy and Rubin went on to reach the semi finals and had chances to win against Seles. McQuillan had a bad year losing many times in the opening rounds. McQuillan loses in the first match at the French Open. Her ranking drops and she does not qualify for Wimbledon or the US Open. At the Olympic Games she lost to Coetzer in a tight match 6-4 7-6.

McQuillan lost to Reinach at the Australian Open in 3 sets. She beats Harvey Wild at Wimbledon, but loses to an in form Raymond.

McQuillan beat Harlard to reach the quarter finals of Brisbane. She beat Rubin to reach the final of Hobart. She reached the third round of the Australian Open where she beat Date. She fell to top players in the first round at the US Open as well as the second round at Wimbledon and the French Open.

In 1993, McQuillan lost a night match to 14 seeded Katerina Maleeva 4-6 7-5 6-2. At Wimbledon she lost in an Indian squealing Kelesi 7-6 6-4. Majoli won their opening round match at the US Open.

 In 1992, McQuillan lost 6-1 2-6 6-2 to Fernandez in the third round in the Australian Open. McQuillan and Provis won the Barcellona Olympic Bronze Medal for Australia in the doubles.

McQuillan made the round of 16 at the Australian and French Open.

In 1990, McQuillan reached the round of 16 in a slam for the first time at the Australian Open. 

Rachel's GRAND SLAM Record