Gary Muller (born 27 December 1964) is a former professional South African tennis player.

Muller turned pro in 1985. His 12-year career included wins over Andre Agassi, Jim Courier, Michael Chang and Stefan Edberg. Muller's best singles result at a Grand Slam was reaching the third round in the 1987 Australian Open in which he lost to Miloslav Mečíř of Czechoslovakia. A more successful doubles player than singles, Muller won eight doubles titles in his career with six different partners and reached a career highest ranking of 7th in November 1993. He reached the semi-final of the men's doubles at four Grand Slams (1986 US Open, 1988 Wimbledon, 1990 Australian Open and 1993 Wimbledon). Muller still holds the record for the most aces served in a three set match (54) in a 1993 Wimbledon Qualifying match against Peter Lundgren.

After his retirement in 1997 Muller worked for eight years as an ATP Tour coach during which time he worked with Jonas Björkman, Stefan Koubek, Sargis Sargsian and Thomas Johansson. He was with Dominic Thiem as his Touring Coach when he clinched the title in Rio in 2017.

Muller was on the ATP Board of Directors as a Player Representative from 2002 to 2004.

He currently resides in Ontario, Canada with his wife and four children.

Career finals

Doubles (8 wins, 12 losses)

ResultNo.DateTournamentSurfacePartnerOpponentsScore
Win1.Jul 1987Schenectady, U.S.HardUnited States Gary DonnellyUnited States Brad Pearce United States Jim Pugh7–6, 6–2
Loss1.Nov 1988Johannesburg, South AfricaHard (i)United States Tim WilkisonUnited States Kevin Curren United States David Pate6–7, 4–6
Win2.Jul 1989Washington, U.S.HardUnited Kingdom Neil BroadUnited States Jim Grabb United States Patrick McEnroe6–7, 7–6, 6–4
Loss2.Aug 1990Cincinnati, U.S.HardUnited Kingdom Neil BroadAustralia Darren Cahill Australia Mark Kratzmann6–7, 2–6
Loss3.Sep 1990Basel, SwitzerlandHard (i)United Kingdom Neil BroadSouth Africa Stefan Kruger South Africa Christo van Rensburg6–4, 6–7, 3–6
Win3.Oct 1990Toulouse, FranceHardUnited Kingdom Neil BroadDenmark Michael Mortensen Netherlands Michiel Schapers7–6, 6–4
Win4.Jul 1991Gstaad, SwitzerlandClaySouth Africa Danie VisserFrance Guy Forget Switzerland Jakob Hlasek7–6, 6–4
Win5.Oct 1991Vienna, AustriaCarpet (i)Sweden Anders JärrydSwitzerland Jakob Hlasek United States Patrick McEnroe6–4, 7–5
Loss4.Feb 1992Memphis, U.S.Hard (i)United States Kevin CurrenAustralia Todd Woodbridge Australia Mark Woodforde5–7, 6–4, 6–7
Win6.Apr 1992Seoul, South KoreaHardUnited States Kevin CurrenNew Zealand Kelly Evernden United States Brad Pearce7–6, 6–4
Loss5.Apr 1993Seoul, South KoreaHardUnited Kingdom Neil BroadSweden Jan Apell Sweden Peter Nyborg7–5, 6–7, 2–6
Loss6.Jun 1993London/Queen's Club, U.K.GrassUnited Kingdom Neil BroadAustralia Todd Woodbridge Australia Mark Woodforde7–6, 3–6, 4–6
Loss7.Jul 1993Stuttgart, GermanyClaySouth Africa Piet NorvalNetherlands Tom Nijssen Czech Republic Cyril Suk6–7, 3–6
Win7.Oct 1993Lyon, FranceCarpet (i)South Africa Danie VisserSouth Africa John-Laffnie de Jager South Africa Stefan Kruger6–3, 7–6
Loss8.Oct 1993Stockholm, SwedenCarpet (i)South Africa Danie VisserAustralia Todd Woodbridge Australia Mark Woodforde1–6, 6–3, 2–6
Loss9.Jun 1994Halle, GermanyGrassFrance Henri LeconteFrance Olivier Delaître France Guy Forget4–6, 7–6, 4–6
Loss10.Oct 1994Ostrava, Czech RepublicCarpetSouth Africa Piet NorvalCzech Republic Martin Damm Czech Republic Karel Nováček4–6, 6–1, 3–6
Loss11.Mar 1995Indian Wells, USAHardSouth Africa Piet NorvalUnited States Tommy Ho New Zealand Brett Steven4–6, 6–7
Loss12.Oct 1996Beijing, ChinaHard (i)Germany Patrik KühnenCzech Republic Martin Damm Russia Andrei Olhovskiy4–6, 5–7
Win8.Feb 1997San Jose, U.S.Hard (i)United States Brian MacPhieThe Bahamas Mark Knowles Canada Daniel Nestor4–6, 7–6, 7–5

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