|Full name||Ian C. Vermaak|
|Country (sports)||South Africa|
28 March 1933 |
Empangeni, Natal, South Africa
|Turned pro||1953 (amateur tour)|
|Retired||1960 (brief periods of activity afterwards)|
|Plays||Right-handed (1-handed backhand)|
|Highest ranking||No. 10 (1959, Lance Tingay)|
|Grand Slam Singles results|
|French Open||F (1959)|
|Grand Slam Doubles results|
|Grand Slam Mixed Doubles results|
|Davis Cup||QF (1964(EU))|
Ian Vermaak (born 28 March 1933) is a former tennis player competing for South Africa. As the No. 4 seed he finished runner-up to Nicola Pietrangeli in the singles final of the Amateur French Championships of Roland-Garros in 1959, after having reached earlier in the season the Hamburg International German Tennis Championships final, losing to William Knight.
Vermaak competed for the South African Davis Cup team in six ties between 1953 and 1960 and compiled a record of five wins and seven losses. In 1956 he won the singles title of the South African Championships, defeating Torsten Johansson in the final in fives sets. In 1959 he defeated his countryman Ray Weedon in the final of the 71st Southampton Grass Court Championships on Long Island, New York.
Grand Slam finals
Singles: 1 (0-1)
|Outcome||Year||Championship||Surface||Opponent in the final||Score in the final|
|Runner-up||1959||French Championships||Clay (Red)||Nicola Pietrangeli||3–6, 6–3, 6–4, 6–1|
- United States Lawn Tennis Association (1972). Official Encyclopedia of Tennis (First Edition), p. 425.
- "Roland-Garros 1959 (Grand Slam) - Men's singles" (PDF). fft.fr. Retrieved 2009-07-03.
- "Wimbledon players archive – Ian Vermaak". AELTC.
- "Davis Cup – Player archive". ITF.
- "Vermaak Cops N.Y. Net Test". The Milwaukee Sentinel. 3 August 1959.
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