| Singles | |
|---|---|
| 1991 Volvo San Francisco | |
| Champion |  Darren Cahill |
| Runner-up |  Brad Gilbert |
| Final score | 6–2, 3–6, 6–4 |
| Draw | 32 (4Q / 3WC) |
| Seeds | 8 |
Andre Agassi was the defending champion, but lost in semifinals to Brad Gilbert. [1] [2]
Darren Cahill won the title by defeating Gilbert 6–2, 3–6, 6–4 in the final. [3] [4]
Andre Agassi (semifinals)
Andrés Gómez (second round) Brad Gilbert (final) John McEnroe (quarterfinals) Tim Mayotte (second round) Darren Cahill (champion) Wally Masur (semifinals)
Gary Muller (first round)| Semifinals | Final | ||||||||||||
| 1 | Andre Agassi | 1 | 2 | ||||||||||
| 3 | Brad Gilbert | 6 | 6 | ||||||||||
| 3 | Brad Gilbert | 2 | 6 | 4 | |||||||||
| 6 | Darren Cahill | 6 | 3 | 6 | |||||||||
| 6 | Darren Cahill | 4 | 6 | 7 | |||||||||
| 7 | Wally Masur | 6 | 4 | 5 | |||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | A Agassi | 77 | 6 | ||||||||||||||||||||||||
| Q | J Tarango | 65 | 3 | 1 | A Agassi | 3 | 6 | 6 | |||||||||||||||||||
| Q | M Ondruska | 1 | 3 |  U Riglewski | 6 | 4 | 3 | ||||||||||||||||||||
| U Riglewski | 6 | 6 | 1 | A Agassi | 6 | 6 | |||||||||||||||||||||
| S Davis | 5 | 3 | K Curren | 2 | 4 | ||||||||||||||||||||||
| K Curren | 7 | 6 | K Curren | 4 | 78 | 6 | |||||||||||||||||||||
 L Herrera | 6 | 77 | L Herrera | 6 | 66 | 2 | |||||||||||||||||||||
| 8 | G Muller | 4 | 64 | 1 | A Agassi | 1 | 2 | ||||||||||||||||||||
| 3 | B Gilbert | 6 | 3 | 6 | 3 | B Gilbert | 6 | 6 | |||||||||||||||||||
| P Kühnen | 3 | 6 | 2 | 3 | B Gilbert | 6 | 6 | ||||||||||||||||||||
| A Mronz | 77 | 6 | A Mronz | 3 | 3 | ||||||||||||||||||||||
| Q | R Leach | 63 | 3 | 3 | B Gilbert | 6 | 5 | 6 | |||||||||||||||||||
| D Goldie | 6 | 5 | 6 | D Goldie | 1 | 7 | 4 | ||||||||||||||||||||
| J Grabb | 4 | 7 | 3 | D Goldie | 2 | 78 | 7 | ||||||||||||||||||||
 T Carbonell | 4 | 66 | 5/WC | T Mayotte | 6 | 66 | 5 | ||||||||||||||||||||
| 5/WC | T Mayotte | 6 | 78 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | D Cahill | 6 | 6 | ||||||||||||||||||||||||
 T Högstedt | 2 | 2 | 6 | D Cahill | 5 | 6 | 6 | ||||||||||||||||||||
| B Garrow | 1 | 1 |  G Raoux | 7 | 4 | 3 | |||||||||||||||||||||
| G Raoux | 6 | 6 | 6 | D Cahill | 7 | 3 | 6 | ||||||||||||||||||||
| M Kratzmann | 6 | 77 | 4/WC | J McEnroe | 6 | 6 | 3 | ||||||||||||||||||||
 V Paloheimo | 3 | 61 | M Kratzmann | 4 | 6 | ||||||||||||||||||||||
 A Sznajder | 3 | 0 | 4/WC | J McEnroe | 6 | 7 | |||||||||||||||||||||
| 4/WC | J McEnroe | 6 | 6 | 6 | D Cahill | 4 | 6 | 7 | |||||||||||||||||||
| 7 | W Masur | 6 | 6 | 7 | W Masur | 6 | 4 | 5 | |||||||||||||||||||
| B Pearce | 1 | 4 | 7 | W Masur | 6 | 6 | |||||||||||||||||||||
 R Krishnan | 77 | 77 | R Krishnan | 3 | 3 | ||||||||||||||||||||||
| A Rahunen | 64 | 61 | 7 | W Masur | 6 | 4 | 7 | ||||||||||||||||||||
| D Pate | 6 | 7 | D Pate | 1 | 6 | 6 | |||||||||||||||||||||
| WC | P Chamberlin | 3 | 5 | D Pate | 1 | 6 | 6 | ||||||||||||||||||||
| Q | B Devening | 6 | 4 | 4 | 2 | A Gómez | 6 | 4 | 2 | ||||||||||||||||||
| 2 | A Gómez | 4 | 6 | 6 | |||||||||||||||||||||||
Jim Courier defeated Andre Agassi in the final, 3–6, 6–4, 2–6, 6–1, 6–4 to win the men's singles tennis title at the 1991 French Open.
Pat Cash defeated Ivan Lendl in the final, 7–6(7–5), 6–2, 7–5 to win the gentlemen's singles tennis title at the 1987 Wimbledon Championships.
Michael Stich defeated Boris Becker in the final, 6–4, 7–6(7–4), 6–4 to win the gentlemen's singles tennis title at the 1991 Wimbledon Championships.
Pete Sampras defeated Andre Agassi in the final, 6–4, 6–3, 6–2 to win the men's singles tennis title at the 1990 US Open. It was his first major title, and the first of a then-record 14 men's singles major titles overall.
Andre Agassi successfully defended his title, defeating Luiz Mattar 6–4, 6–3 in the final.
Andre Agassi won in the final 6–2, 6–4 against Paul Annacone.
Andre Agassi was the defending champion, but lost in the fourth round to David Wheaton.
Stefan Edberg was the defending champion, but lost to Pete Sampras in the quarterfinals.
Stefan Edberg was the defending champion, but lost to Mats Wilander in the final 6–3, 6–7, 6–7.
Tim Mayotte was the defending champion, but lost in the third round to Todd Witsken.
Andrés Gómez was the defending champion, but lost in quarterfinals to Tomáš Šmíd.
Brad Gilbert was the defending champion, but lost in the first round to Gary Muller.
Michael Chang was the defending champion, but did not compete this year.
Neil Broad and Gary Muller were the defending champions, but lost in the second round to Kent Kinnear and Brad Pearce.
Miloslav Mečíř was the defending champion, but lost in the third round to Thomas Muster.
Andre Agassi was the defending champion and successfully defended his title, by defeating Petr Korda 6–3, 6–4 in the final.
Darren Cahill was the defending champion, but did not compete this year.
Jacco Eltingh was the defending champion, but lost in the first round to Richey Reneberg.
Brad Gilbert was the defending champion, but lost in the quarterfinals to MaliVai Washington.
Karel Nováček was the defending champion, but chose to compete at Hilversum during the same week.