| Singles | |
|---|---|
| 1991 Riklis Classic | |
| Champion |  Leonardo Lavalle |
| Runner-up |  Christo van Rensburg |
| Final score | 6–2, 3–6, 6–3 |
Andrei Chesnokov was the defending champion, but did not participate this year.
Leonardo Lavalle won the tournament, beating Christo van Rensburg in the final, 6–2, 3–6, 6–3.
Andrei Cherkasov (quarterfinals)
Martín Jaite (second round)
Mark Koevermans (first round)
Amos Mansdorf (first round)
Olivier Delaître (quarterfinals)
Lars Jonsson (first round) Javier Frana (second round) Jacco Eltingh (first round)| Semifinals | Final | ||||||||||||
| Q | Leonardo Lavalle | 6 | 77 | ||||||||||
 Bryan Shelton | 4 | 65 | |||||||||||
| Q | Leonardo Lavalle | 6 | 3 | 6 | |||||||||
| Christo van Rensburg | 2 | 6 | 3 | ||||||||||
| Christo van Rensburg | 6 | 2 | 6 | ||||||||||
| Gilad Bloom | 3 | 6 | 3 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | A Cherkasov | 7 | 6 | ||||||||||||||||||||||||
| WC | S Perkiss | 5 | 4 | 1 | A Cherkasov | 6 | 79 | ||||||||||||||||||||
| C Adams | 6 | 6 | C Adams | 3 | 67 | ||||||||||||||||||||||
| Q | O Sela | 3 | 4 | 1 | A Cherkasov | 5 | 77 | 3 | |||||||||||||||||||
 C Pridham | 6 | 6 | Q | L Lavalle | 7 | 65 | 6 | ||||||||||||||||||||
| M Wostenholme | 4 | 3 | C Pridham | 4 | 63 | ||||||||||||||||||||||
| Q | L Lavalle | 4 | 6 | 6 | Q | L Lavalle | 6 | 77 | |||||||||||||||||||
| 8 | J Eltingh | 6 | 3 | 4 | Q | L Lavalle | 6 | 77 | |||||||||||||||||||
| 3 | M Koevermans | 1 | 0 | B Shelton | 4 | 65 | |||||||||||||||||||||
| J Apell | 6 | 6 | J Apell | 5 | 6 | 4 | |||||||||||||||||||||
| Q | P Nyborg | 6 | 6 | Q | P Nyborg | 7 | 4 | 6 | |||||||||||||||||||
| WC | O Weinberg | 2 | 4 | Q | P Nyborg | 64 | 4 | ||||||||||||||||||||
 V Roubíček | 3 | 64 | B Shelton | 77 | 6 | ||||||||||||||||||||||
| WC | R Weidenfeld | 6 | 77 | WC | R Weidenfeld | 3 | 1 | ||||||||||||||||||||
| B Shelton | 6 | 77 | B Shelton | 6 | 6 | ||||||||||||||||||||||
| 6 | L Jonsson | 3 | 61 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | O Delaître | 6 | 4 | 6 | |||||||||||||||||||||||
 B Steven | 2 | 6 | 1 | 5 | O Delaître | 6 | 7 | ||||||||||||||||||||
| T Anzari | 6 | 4 | 3 | D Rikl | 3 | 5 | |||||||||||||||||||||
| D Rikl | 2 | 6 | 6 | 5 | O Delaître | 3 | 3 | ||||||||||||||||||||
| M Laurendeau | 6 | 4 | 4 | C van Rensburg | 6 | 6 | |||||||||||||||||||||
| H Holm | 1 | 6 | 6 | H Holm | 66 | 1 | |||||||||||||||||||||
| C van Rensburg | 6 | 6 | C van Rensburg | 78 | 6 | ||||||||||||||||||||||
| 4 | A Mansdorf | 3 | 2 | C van Rensburg | 6 | 2 | 6 | ||||||||||||||||||||
| 7 | J Frana | 6 | 6 | G Bloom | 3 | 6 | 3 | ||||||||||||||||||||
| M Schapers | 3 | 3 | 7 | J Frana | 3 | 4 | |||||||||||||||||||||
| Q | J Carlsson | 3 | 6 | 6 | Q | J Carlsson | 6 | 6 | |||||||||||||||||||
| V Gabrichidze | 6 | 4 | 2 | Q | J Carlsson | 3 | 5 | ||||||||||||||||||||
| M Střelba | 3 | 2 | G Bloom | 6 | 7 | ||||||||||||||||||||||
| G Bloom | 6 | 6 | G Bloom | 6 | 6 | ||||||||||||||||||||||
 A Antonitsch | 3 | 1 | 2 | M Jaite | 3 | 4 | |||||||||||||||||||||
| 2 | M Jaite | 6 | 6 | ||||||||||||||||||||||||
Guillermo Cañas was the defending champion but lost in the quarterfinals to Karol Kučera.
Ivan Lendl was the defending champion, but did not participate this year.
Andrei Chesnokov defeated Thomas Muster in the final, 7–5, 6–3, 6–3 to win the singles tennis title at the 1990 Monte Carlo Open.
Thomas Muster defeated Andrei Chesnokov in the final, 6–1, 6–3, 6–1 to win the men's singles tennis title at the 1990 Italian Open.
Karel Nováček was the defending champion, but the second seeded Czech lost in the first round to Andrei Cherkasov. Carlos Costa won in the final 6–1, 6–2, 6–3 against Magnus Gustafsson and captured his third individual title at the ATP Tour.
Gustavo Kuerten was the defending champion but lost in the second round to Lars Burgsmüller.
Todd Woodbridge and Mark Woodforde were the defending champions but lost in the quarterfinals to Ellis Ferreira and Jan Siemerink.
Karel Nováček defeated Magnus Gustafsson in the final, 6–3, 6–3, 5–7, 0–6, 6–1 to win the singles tennis title at the 1991 Hamburg European Open.
Sergi Bruguera defeated Boris Becker in the final, 5–7, 6–4, 7–6(8–6), 7–6(7–4) to win the singles tennis title at the 1991 Monte Carlo Open.
Thomas Enqvist was the defending champion, but lost in the quarterfinals this year.
Jordi Arrese was the defending champion and successfully defended his title, beating Alberto Berasategui in the final, 6–4, 3–6, 6–3.
Nicolas Kiefer was the defending champion, but lost in the quarterfinals this year.
Henri Leconte was the defending champion, but lost in the quarterfinals this year.
Mark Knowles and Daniel Nestor were the defending champions, but lost in the quarterfinals this year.
Andre Agassi defeated Ivan Lendl in the final, 3–6, 6–2, 6–0 to win the men's singles tennis title at the 1992 Canadian Open.
Andrei Chesnokov defeated Petr Korda in the final, 3–6, 6–4, 6–3 to win the men's singles tennis title at the 1991 Canadian Open.
Chuck Adams was the defending champion, but lost in the quarterfinals this year.
Andrei Olhovskiy was the defending champion, but lost in the quarterfinals to Daniel Vacek.
Guy Forget was the defending champion, but lost in the quarterfinals to Rodolphe Gilbert.
Andrei Medvedev was the defending champion, but lost in the semifinals to Michael Stich.