1991 Estoril Open
| 1991 Estoril Open | |
|---|---|
| Date | April 1 – April 8 |
| Edition | 2nd |
| Surface | Clay / Outdoor |
| Location |
Oeiras,  Portugal
|
| Champions | |
| Men's Singles | |
 Sergi Bruguera
|
|
| Men's Doubles | |
 Paul Haarhuis / Mark Koevermans
|
|
The 1991 Estoril Open was a tennis tournament played on outdoor clay courts. This event was the 2nd edition of the Estoril Open, included in the 1991 ATP Tour World Series. The event took place at the Estoril Court Central, in Oeiras, Portugal, from April 1 through April 8, 1991.
Sergi Bruguera def. 
Karel Nováček, 7–6(9–7), 6–1
Paul Haarhuis / Mark Koevermans def. Tom Nijssen / Cyril Suk, 6–3, 6–3
...
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