Oporto 1991 ATP
Final
| Winner | Loser | Score | |
|---|---|---|---|
| Thomas Muster | d. | Horst Skoff | 6-2 6-7(2) 6-4 |
Semifinals
| Winner | Loser | Score | |
|---|---|---|---|
| Horst Skoff | d. | Eduardo Masso | 6-4 6-4 |
| Thomas Muster | d. | Carlos Costa | 6-7(4) 6-1 6-3 |
Quarterfinals
| Winner | Loser | Score | |
|---|---|---|---|
| Horst Skoff | d. | Gabriel Markus | 6-1 6-7(2) 6-2 |
| Eduardo Masso | d. | Magnus Larsson | 6-3 4-6 6-1 |
| Carlos Costa | d. | Jimmy Arias | 6-4 6-1 |
| Thomas Muster | d. | Fabrice Santoro | 6-7(4) 6-1 6-1 |
Round of 16
| Winner | Loser | Score | |
|---|---|---|---|
| Horst Skoff | d. | Bart Wuyts | 6-3 5-7 6-1 |
| Gabriel Markus | d. | Renzo Furlan | 2-6 7-6(6) 6-2 |
| Eduardo Masso | d. | Javier Sanchez | 6-3 7-6(4) |
| Magnus Larsson | d. | Lars Jonsson | 3-6 6-3 7-6(2) |
| Carlos Costa | d. | Richard Fromberg | 6-3 5-7 6-4 |
| Jimmy Arias | d. | Andres Vysand | 6-4 6-2 |
| Fabrice Santoro | d. | Francisco Roig | 7-5 6-2 |
| Thomas Muster | d. | Thierry Champion | 4-6 6-3 6-2 |
Round of 32
| Winner | Loser | Score | |
|---|---|---|---|
| Horst Skoff | d. | Cedric Pioline | 6-4 6-2 |
| Bart Wuyts | d. | Andrei Medvedev | 6-0 4-6 6-3 |
| Gabriel Markus | d. | Carl Uwe Steeb | 6-1 4-2 RET |
| Renzo Furlan | d. | Udo Riglewski | 7-6(2) 6-2 |
| Eduardo Masso | d. | Jordi Arrese | 6-2 5-7 6-1 |
| Javier Sanchez | d. | Claudio Pistolesi | 7-6(7) 2-6 6-4 |
| Lars Jonsson | d. | Stefano Pescosolido | 4-6 2-0 RET |
| Magnus Larsson | d. | Silvio Moine | 6-1 6-4 |
| Richard Fromberg | d. | Andrea Gaudenzi | 3-6 6-3 6-3 |
| Carlos Costa | d. | Roberto Azar | 6-3 6-4 |
| Jimmy Arias | d. | Nuno Marques | 3-6 6-1 6-4 |
| Andres Vysand | d. | Mark Koevermans | 6-2 6-3 |
| Fabrice Santoro | d. | Aki Rahunen | 6-3 6-2 |
| Francisco Roig | d. | Franco Davin | 1-6 6-1 6-1 |
| Thomas Muster | d. | Pedro Rebolledo | 1-6 6-4 6-0 |
| Thierry Champion | d. | Omar Camporese | 4-6 6-4 6-3 |