| Doubles | |
|---|---|
| 1991 Puerto Rico Open | |
| Champions |  Rika Hiraki  Florencia Labat |
| Runners-up |  Sabine Appelmans  Camille Benjamin |
| Score | 6–3, 6–3 |
| Draw | 16 (1Q) |
| Seeds | 4 |
Elena Brioukhovets and Natalia Medvedeva were the defending champions, but they did not compete this year.
Rika Hiraki and Florencia Labat won the title by defeating Sabine Appelmans and Camille Benjamin 6–3, 6–3 in the final. [1]
Sabine Appelmans / Camille Benjamin (final) Shannan McCarthy / 
Mary Pierce (quarterfinals) Carrie Cunningham / Ann Grossman (semifinals)
Rene Alter / Shaun Stafford (quarterfinals)| First round | Quarterfinals | Semifinals | Final | ||||||||||||||||||||||||
| 1 | S Appelmans C Benjamin | 6 | 6 | ||||||||||||||||||||||||
 L Corsato  P Vásquez | 3 | 3 | 1 | S Appelmans C Benjamin | 6 | 6 | |||||||||||||||||||||
 P Ritter L Spadea | 6 | 6 | P Ritter L Spadea | 1 | 4 | ||||||||||||||||||||||
 Lisa Seemann J Watanabe | 3 | 1 | 1 | S Appelmans C Benjamin | 78 | 2 | |||||||||||||||||||||
| 4 | R Alter S Stafford | 1 | 6 | 6 | J Fuchs  M Strandlund | 66 | 1r | ||||||||||||||||||||
| P O'Reilly Terri O'Reilly | 6 | 4 | 4 | 4 | R Alter S Stafford | 6 | 1 | 3 | |||||||||||||||||||
| J Fuchs M Strandlund | 2 | 6 | 6 | J Fuchs M Strandlund | 3 | 6 | 6 | ||||||||||||||||||||
| A Coetzer T Whittington | 6 | 0 | 4 | 1 | S Appelmans C Benjamin | 3 | 3 | ||||||||||||||||||||
A Schwartz  E Viqueira | 0 | 6 | 4 | R Hiraki F Labat | 6 | 6 | |||||||||||||||||||||
 S Hack B Rittner | 6 | 1 | 6 | S Hack B Rittner | 4 | 3 | |||||||||||||||||||||
D Faber  P Thorén | 3 | 5 | 3 | C Cunningham A Grossman | 6 | 6 | |||||||||||||||||||||
| 3 | C Cunningham A Grossman | 6 | 7 | 3 | C Cunningham A Grossman | 4 | 2 | ||||||||||||||||||||
| L Allen A Keller | 1 | 4 | R Hiraki F Labat | 6 | 6 | ||||||||||||||||||||||
| R Hiraki F Labat | 6 | 6 | R Hiraki F Labat | 7 | 6 | ||||||||||||||||||||||
| Q | Christine O'Reilly L Weerasuriya | 3 | 5 | 2 | S McCarthy M Pierce | 5 | 3 | ||||||||||||||||||||
| 2 | S McCarthy M Pierce | 6 | 7 | ||||||||||||||||||||||||
Ruxandra Dragomir was the defending champion but lost in the first round to Julie Halard-Decugis.
Eva Melicharová and Helena Vildová were the defending champions but they competed with different partners that year, Melicharova with Cătălina Cristea and Vildova with Karina Habšudová.
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Lindsay Davenport and Mary Joe Fernández were the defending champions, but played this year with different partners. Davenport teamed up with Jana Novotná and lost in third round to Conchita Martínez and Patricia Tarabini, while Fernández teamed up with Lisa Raymond, losing in the final.
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Patty Schnyder was the defending champion, but lost in quarterfinals to Arantxa Sánchez Vicario.
Kristina Brandi was the defending champion, but lost in semifinals to Ruxandra Dragomir
Sabine Appelmans was the defending champion, but did not compete this year.
María Sánchez Lorenzo was the defending champion, but did not compete this year.
Justine Henin was the defending champion, and did not compete this year.
Laura Golarsa and Katarina Srebotnik were the defending champions, but none competed this year. Golarsa was injured and couldn't play in the entire season, while Srebotnik competed in the Fed Cup at the same week.
Kimiko Date was the defending champion and successfully defended her title, by defeating Stephanie Rottier 6–1, 6–3 in the final.
In the first edition of the tournament, Yayuk Basuki won the title by defeating Naoko Sawamatsu 6–2, 6–2 in the final.
Sabine Appelmans was the defending champion, but did not compete this year.
Natalia Medvedeva was the defending champion, but lost in the semifinals to Katrina Adams.
Yayuk Basuki was the defending champion, but lost in the first round to Nicole Arendt.
Belinda Cordwell was the defending champion, but lost in the second round to Patricia Hy.
Judith Wiesner was the defending champion, but lost in the final 4–6, 6–1, 6–3 to Naoko Sawamatsu. Curiously, both players faced each other at the final match in last year.
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Jennifer Capriati was the defending champion, but did not compete this year.