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Date
Winner
Loser
Tournament
Round
Score
1986-11-17
Danie Visser (110)
Schalk Van Der Merwe ()
Johannesburg
R16
6-3 6-4
1986-11-17
Schalk Van Der Merwe ()
Jakob Hlasek (27)
Johannesburg
R32
6-3 7-6
1983-10-10
Aaron Krickstein ()
Schalk Van Der Merwe ()
Tel Aviv
R16
6-2 7-5
1983-10-10
Schalk Van Der Merwe ()
Frank Puncec ()
Tel Aviv
R32
6-3 3-6 7-6
1983-09-12
Mario Martinez (35)
Schalk Van Der Merwe ()
Palermo
R32
6-2 5-7 6-3
1983-02-21
Victor Amaya (83)
Schalk Van Der Merwe ()
La Quinta
R32
6-2 6-0
1983-02-21
Schalk Van Der Merwe ()
Bruce Manson (84)
La Quinta
R64
2-6 6-4 6-3
1982-11-22
Danie Visser ()
Schalk Van Der Merwe ()
Johannesburg
R32
6-3 6-4
1982-08-31
Bob Lutz ()
Schalk Van Der Merwe ()
US Open
R32
6-7 6-4 6-2 6-2
1982-08-31
Schalk Van Der Merwe ()
Raul Ramirez (21)
US Open
R64
6-2 6-3 5-7 6-4
1982-08-31
Schalk Van Der Merwe ()
Derek Tarr ()
US Open
R128
6-1 5-7 6-3 3-6 6-4
1982-08-16
Eddie Edwards ()
Schalk Van Der Merwe ()
Stowe
R32
6-3 3-6 7-6
1982-08-09
Vincent Van Patten (35)
Schalk Van Der Merwe ()
Cleveland
R32
6-2 3-6 6-1
1982-07-26
Van Winitsky (42)
Schalk Van Der Merwe ()
South Orange
R32
5-7 7-6 6-2
1982-07-19
Bernhard Pils ()
Schalk Van Der Merwe ()
Washington
R64
7-5 7-6
1982-07-12
Alejandro Ganzabal (92)
Schalk Van Der Merwe ()
Boston
R32
6-4 6-4
1982-07-12
Schalk Van Der Merwe ()
Cary Leeds ()
Boston
R64
6-4 6-0
1982-07-05
Hank Pfister (33)
Schalk Van Der Merwe ()
Newport
R32
7-5 6-2
1982-06-21
Steve Denton (23)
Schalk Van Der Merwe ()
Wimbledon
R64
6-7 7-5 3-6 6-4 13-11
1982-06-21
Schalk Van Der Merwe ()
Terry Moor (89)
Wimbledon
R128
6-4 6-2 7-6
1982-04-19
Jose Luis Damiani (58)
Schalk Van Der Merwe ()
Bournemouth
R32
6-1 6-1
1982-03-15
Christophe Roger Vasselin ()
Schalk Van Der Merwe ()
Metz
QF
6-2 4-6 6-3
1982-03-15
Schalk Van Der Merwe ()
Paul Torre ()
Metz
R16
6-4 5-7 6-3
1982-03-15
Schalk Van Der Merwe ()
Dick Stockton (92)
Metz
R32
6-3 5-7 6-4
1981-04-06
Tony Graham ()
Schalk Van Der Merwe ()
Johannesburg
R16
7-6 6-2
1981-04-06
Schalk Van Der Merwe ()
Henri De Wet ()
Johannesburg
R32
5-7 6-2 6-2
1980-11-25
Fritz Buehning (100)
Schalk Van Der Merwe ()
Johannesburg
R32
6-2 6-3
1980-05-12
Per Hjertquist ()
Schalk Van Der Merwe ()
Hamburg
R64
3-6 6-0 6-0
1980-04-08
Patrick Proisy ()
Schalk Van Der Merwe ()
Johannesburg
R32
2-6 6-1 6-4
1978-12-04
Bernard Mitton (62)
Schalk Van Der Merwe ()
Johannesburg
R32
6-3 6-2