| Singles | |
|---|---|
| 1991 Puerto Rico Open | |
| Champion |  Julie Halard |
| Runner-up |  Amanda Coetzer |
| Score | 7–5, 7–5 |
| Draw | 32 (4Q/1LL) |
| Seeds | 8 |
Jennifer Capriati was the defending champion, but did not compete this year.
Julie Halard won the title by defeating Amanda Coetzer 7–5, 7–5 in the final. [1]
Gigi Fernández (quarterfinals) Julie Halard (champion)
Sabine Appelmans (semifinals) Mary Pierce (semifinals)
Barbara Rittner (quarterfinals) Susan Sloane-Lundy (quarterfinals)
Florencia Labat (second round)
| Semifinals | Final | ||||||||||||
| Amanda Coetzer | 3 | 6 | 7 | ||||||||||
| 3 | Sabine Appelmans | 6 | 3 | 5 | |||||||||
| Amanda Coetzer | 5 | 5 | |||||||||||
| 2 | Julie Halard | 7 | 7 | ||||||||||
| 4 | Mary Pierce | 5 | 1 | ||||||||||
| 2 | Julie Halard | 7 | 6 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | G Fernández | 6 | 4 | 6 | |||||||||||||||||||||||
 P Ritter | 1 | 6 | 4 | 1 | G Fernández | 6 | 6 | ||||||||||||||||||||
| Q | C Benjamin | 6 | 6 | Q | C Benjamin | 4 | 3 | ||||||||||||||||||||
| Q | A Schwartz | 4 | 4 | 1 | G Fernández | 4 | 2 | ||||||||||||||||||||
 E Viqueira | 1 | 0 | A Coetzer | 6 | 6 | ||||||||||||||||||||||
| A Coetzer | 6 | 6 | A Coetzer | 6 | 6 | ||||||||||||||||||||||
 R Alter | 6 | 6 | R Alter | 2 | 2 | ||||||||||||||||||||||
| Q | J Watanabe | 2 | 1 | A Coetzer | 3 | 6 | 7 | ||||||||||||||||||||
| 3 | S Appelmans | 7 | 6 | 3 | S Appelmans | 6 | 3 | 5 | |||||||||||||||||||
 R Hiraki | 5 | 2 | 3 | S Appelmans | 6 | 6 | |||||||||||||||||||||
 L Corsato | 3 | 6 | 5 | D Faber | 4 | 1 | |||||||||||||||||||||
| D Faber | 6 | 4 | 7 | 3 | S Appelmans | 6 | 6 | ||||||||||||||||||||
| LL | M Drake | 6 | 2 | 6 | 6 | S Sloane-Lundy | 4 | 1 | |||||||||||||||||||
 R Baranski | 1 | 6 | 2 | LL | M Drake | 0 | 3 | ||||||||||||||||||||
| V Martinek | 0 | 1 | 6 | S Sloane-Lundy | 6 | 6 | |||||||||||||||||||||
| 6 | S Sloane-Lundy | 6 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 7 | F Labat | 6 | 3 | 6 | |||||||||||||||||||||||
| L Allen | 1 | 6 | 4 | 7 | F Labat | 1 | 0 | ||||||||||||||||||||
| A Leand | 2 | 1 | C Cunningham | 6 | 6 | ||||||||||||||||||||||
| C Cunningham | 6 | 6 | C Cunningham | 6 | 1 | 2 | |||||||||||||||||||||
 P Thorén | 61 | 3 | 4 | M Pierce | 3 | 6 | 6 | ||||||||||||||||||||
| S Rehe | 77 | 6 | S Rehe | 3 | 6 | 5 | |||||||||||||||||||||
| A Grossman | 3 | 1 | 4 | M Pierce | 6 | 0 | 7 | ||||||||||||||||||||
| 4 | M Pierce | 6 | 6 | 4 | M Pierce | 5 | 1 | ||||||||||||||||||||
| 5 | B Rittner | 6 | 6 | 2 | J Halard | 7 | 6 | ||||||||||||||||||||
 A Gavaldón | 3 | 3 | 5 | B Rittner | 6 | 7 | |||||||||||||||||||||
| A Keller | 6 | 6 | A Keller | 4 | 5 | ||||||||||||||||||||||
| S Stafford | 3 | 3 | 5 | B Rittner | 7 | 1 | 64 | ||||||||||||||||||||
 M Strandlund | 6 | 2 | 1 | 2 | J Halard | 5 | 6 | 77 | |||||||||||||||||||
| Q | C Kuhlman | 3 | 6 | 6 | Q | C Kuhlman | 4 | 4 | |||||||||||||||||||
| S Hack | 3 | 4 | 2 | J Halard | 6 | 6 | |||||||||||||||||||||
| 2 | J Halard | 6 | 6 | ||||||||||||||||||||||||
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