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Date
Winner
Loser
Tournament
Round
Score
1990-02-05
Horacio De La Pena (130)
Guillermo Rivas (219)
Guaruja
R32
6-2 6-3
1989-08-21
Cristiano Caratti (326)
Guillermo Rivas (217)
San Marino
R32
7-6 6-4
1989-08-14
Gustavo Giussani (178)
Guillermo Rivas (220)
St. Vincent
R16
6-1 6-1
1989-08-14
Guillermo Rivas (220)
Cyril Suk (265)
St. Vincent
R32
6-3 7-6
1989-08-07
Marcelo Filippini (67)
Guillermo Rivas (196)
Prague
R16
6-1 6-1
1989-08-07
Guillermo Rivas (196)
Peter Hajek ()
Prague
R32
6-4 7-6
1989-07-31
Nicklas Kulti (202)
Guillermo Rivas (189)
Bastad
R32
6-3 6-7 6-2
1989-07-10
Broderick Dyke (169)
Guillermo Rivas (196)
Boston
R32
7-5 6-3
1989-07-10
Guillermo Rivas (196)
John Ross (272)
Boston
R64
6-4 6-2
1989-05-08
Johan Kriek (34)
Guillermo Rivas (158)
Charleston
R32
6-3 7-5
1989-05-01
Luiz Mattar (29)
Guillermo Rivas (157)
Forest Hills
R32
6-2 0-6 7-5
1989-05-01
Guillermo Rivas (157)
Craig Campbell (512)
Forest Hills
R64
6-2 6-0
1989-04-10
Martin Jaite (64)
Guillermo Rivas (168)
Rio de Janeiro
QF
6-1 6-3
1989-04-10
Guillermo Rivas (168)
Marcelo Hennemann (233)
Rio de Janeiro
R16
6-3 6-4
1989-04-10
Guillermo Rivas (168)
Danilo Marcelino (141)
Rio de Janeiro
R32
3-6 7-6 6-4
1988-11-07
Eduardo Bengoechea (93)
Guillermo Rivas (207)
Buenos Aires
R32
6-1 6-4
1988-10-31
Diego Perez (157)
Guillermo Rivas (192)
Sao Paulo
R32
0-6 6-2 6-3
1988-07-25
Yannick Noah (9)
Guillermo Rivas (262)
Bordeaux
R32
6-7 7-5 6-3
1986-11-10
Horst Skoff (41)
Guillermo Rivas (262)
Buenos Aires
R32
6-1 7-6
1986-06-16
Francisco Maciel (46)
Guillermo Rivas (260)
Athens
R32
6-1 6-2
1986-06-09
Francisco Maciel (47)
Guillermo Rivas (266)
Bologna
R32
4-6 6-4 6-3
1985-08-05
Andreas Maurer (41)
Guillermo Rivas (224)
Kitzbuhel
R32
6-1 6-0
1985-08-05
Guillermo Rivas (224)
Claudio Mezzadri (156)
Kitzbuhel
R64
6-4 2-6 6-4
1985-07-22
Givaldo Barbosa (120)
Guillermo Rivas (215)
Hilversum
R32
6-4 6-4
1985-07-15
Alessandro De Minicis (158)
Guillermo Rivas (162)
Bastad
R32
6-1 7-6
1985-07-08
Paul Mcnamee (49)
Guillermo Rivas (157)
Boston
R64
6-4 6-1
1985-05-20
Aaron Krickstein (12)
Guillermo Rivas (116)
Florence
R32
6-2 5-7 6-3
1985-05-06
Lawson Duncan (68)
Guillermo Rivas (146)
Forest Hills
R16
6-3 6-4
1985-05-06
Guillermo Rivas (146)
Tim Wilkison (36)
Forest Hills
R32
3-6 6-3 7-6
1985-05-06
Guillermo Rivas (146)
Matt Mitchell (63)
Forest Hills
R64
7-5 6-4
1985-03-18
Bruce Derlin (125)
Guillermo Rivas (157)
Nancy
R32
6-1 6-1
1985-02-25
Christian Miniussi (189)
Guillermo Rivas (158)
Buenos Aires
R32
6-2 4-6 6-4
1984-10-01
Christian Miniussi (235)
Guillermo Rivas (150)
Barcelona
R64
4-6 6-3 7-5
1984-09-17
Alberto Tous (135)
Guillermo Rivas (152)
Geneva
R32
7-6 7-6
1984-09-10
Amos Mansdorf (273)
Guillermo Rivas (158)
Tel Aviv
R16
1-6 6-4 6-2
1984-09-10
Guillermo Rivas (158)
Eylon Sinai (630)
Tel Aviv
R32
6-4 6-7 6-3
1984-07-30
Pedro Rebolledo (64)
Guillermo Rivas (155)
North Conway
R64
6-4 6-1