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Date
Winner
Loser
Tournament
Round
Score
1979-11-27
Pascal Portes (71)
Willem Prinsloo ()
Johannesburg
R32
7-5 6-3
1979-08-28
Tom Gullikson (74)
Willem Prinsloo ()
US Open
R128
6-3 6-4 6-2
1979-08-13
Gene Stuart Malin ()
Willem Prinsloo ()
Cleveland
R32
6-3 2-6 6-2
1979-08-06
Robert Lutz (29)
Willem Prinsloo ()
Colombus
R32
6-2 6-2
1979-07-30
Chris Kachel ()
Willem Prinsloo ()
South Orange
R32
6-4 3-6 6-1
1979-07-14
Warren Maher ()
Willem Prinsloo ()
Washington
R64
3-6 6-1 6-2
1979-04-16
Heinz Gunthardt (64)
Willem Prinsloo ()
Johannesburg
R16
3-6 6-2 6-2
1979-04-16
Willem Prinsloo ()
Bob Hewitt ()
Johannesburg
R32
6-1 6-4
1979-02-12
Andrew Jarrett ()
Willem Prinsloo ()
Sarasota
R32
6-1 3-6 6-4
1979-01-29
Colin Dibley ()
Willem Prinsloo ()
Little Rock
R32
6-2 6-3
1978-09-25
Robert Vant Hof ()
Willem Prinsloo ()
San Francisco
R64
6-4 6-3
1978-09-18
Gene Mayer (56)
Willem Prinsloo (96)
Hartford
R16
6-2 6-3
1978-09-18
Willem Prinsloo (96)
Dick Bohrnstedt ()
Hartford
R32
6-4 4-6 6-4
1978-08-29
Dick Stockton ()
Willem Prinsloo ()
US Open
R64
6-1 7-5
1978-08-29
Willem Prinsloo ()
Tim Garcia ()
US Open
R128
6-4 6-3
1978-08-21
David Carter ()
Willem Prinsloo (97)
Atlanta
R32
6-7 6-3 6-0
1978-08-20
Van Winitsky ()
Willem Prinsloo (97)
Cleveland
R16
6-3 6-3
1978-08-20
Willem Prinsloo (97)
Steve Denton ()
Cleveland
R32
6-3 4-6 7-6
1977-11-28
Frew Mcmillan (87)
Willem Prinsloo ()
Johannesburg WCT
R16
6-4 6-2
1977-11-28
Willem Prinsloo ()
Jaime Fillol (19)
Johannesburg WCT
R32
6-3 6-4
1977-09-19
Alvaro Fillol ()
Willem Prinsloo (97)
Paris
R32
7-5 6-2
1977-08-31
Onny Parun ()
Willem Prinsloo ()
US Open
R64
3-6 6-0 6-1
1977-08-31
Willem Prinsloo ()
Jeff Borowiak (20)
US Open
R128
3-6 7-6 6-1
1977-08-23
Corrado Barazzutti (23)
Willem Prinsloo (93)
Boston
R64
6-2 6-3
1977-08-16
John Alexander (21)
Willem Prinsloo (89)
Toronto
R32
6-1 6-1
1977-08-16
Willem Prinsloo (89)
Jun Kuki ()
Toronto
R64
6-4 7-5
1977-08-08
Stan Smith (16)
Willem Prinsloo (89)
Columbus
R32
6-0 6-2
1977-08-08
Willem Prinsloo (89)
Larry Turville ()
Columbus
R64
6-3 7-6
1977-07-31
Harold Solomon (9)
Willem Prinsloo (87)
North Conway
R64
6-1 6-2
1977-07-25
John Whitlinger ()
Willem Prinsloo (87)
Louisville
R64
6-2 6-4
1977-07-18
Ricardo Ycaza ()
Willem Prinsloo (83)
Washington
R64
7-6 6-3
1977-07-11
Bob Lutz (21)
Willem Prinsloo (83)
Kitzbuhel
R32
4-6 6-3 6-1
1977-07-03
Jeff Borowiak (41)
Willem Prinsloo (81)
Gstaad
R32
6-1 6-3
1977-06-20
Jonathan Smith ()
Willem Prinsloo (85)
Wimbledon
R128
6-4 6-4 6-2
1977-06-13
David Lloyd ()
Willem Prinsloo (89)
Queen's Club
R64
6-4 6-3
1977-06-06
Jurgen Fassbender (65)
Willem Prinsloo (90)
Brussels
R32
6-2 6-3
1977-05-23
Antonio Zugarelli (25)
Willem Prinsloo (89)
Roland Garros
R128
6-1 6-1 6-4
1976-11-23
Harold Solomon ()
Willem Prinsloo ()
Johannesburg - WCT
QF
7-5 6-0
1976-11-23
Willem Prinsloo ()
S Sullivan ()
Johannesburg - WCT
R16
6-1 4-6 6-2
1976-11-23
Willem Prinsloo ()
Klaus Eberhard ()
Johannesburg - WCT
R32
6-3 7-5
1976-11-23
Willem Prinsloo ()
Onny Parun ()
Johannesburg - WCT
R64
6-3 6-4
1975-04-28
Colin Dowdeswell (235)
Willem Prinsloo ()
Nice
R32
2-6 7-5 8-6
1975-04-28
Willem Prinsloo ()
Frank Froehling ()
Nice
R64
7-6 6-4
1972-04-08
Andre Van Der Merwe B ()
Willem Prinsloo ()
Johannesburg
R128
2-6 6-4 6-3 7-5
1971-04-05
John Alexander ()
Willem Prinsloo ()
Johannesburg
R64
6-1 6-2 6-3
1971-04-05
Willem Prinsloo ()
Jeff Twist ()
Johannesburg
R128
6-7 6-2 6-4 6-4