2003 Estoril Open
| 2003 Estoril Open | |
|---|---|
| Date | 7–13 April |
| Edition | 14th (ATP) / 7th (WTA) |
| Surface | Clay / outdoor |
| Location | Oeiras, Portugal |
| Champions | |
| Men's singles | |
 Nikolay Davydenko | |
| Women's singles | |
 Magüi Serna | |
| Men's doubles | |
 Mahesh Bhupathi /  Max Mirnyi | |
| Women's doubles | |
 Petra Mandula /  Patricia Wartusch | |
The 2003 Estoril Open was a tennis tournament played on outdoor clay courts at the Estoril Court Central in Oeiras in Portugal that was part of the International Series of the 2003 ATP Tour and of Tier IV of the 2003 WTA Tour. The tournament ran from 7 April until 13 April 2003. Nikolay Davydenko and Magüi Serna won the singles title.
Finals
Men's singles
Nikolay Davydenko defeated 
Agustín Calleri 6–4, 6–3
- It was Davydenko's 2nd title of the year and the 2nd of his career.
Women's singles
Magüi Serna defeated 
Julia Schruff 6–4, 6–1
- It was Serna's 1st title of the year and the 3rd of her career.
Men's doubles
Mahesh Bhupathi / Max Mirnyi defeated Lucas Arnold / Mariano Hood 6–1, 6–2
- It was Bhupathi's 1st title of the year and the 27th of his career. It was Mirnyi's 3rd title of the year and the 16th of his career.
Women's doubles
Petra Mandula / Patricia Wartusch defeated 
Maret Ani / 
Emmanuelle Gagliardi 6–7(3–7), 7–6(7–3), 6–2
- It was Mandula's 1st title of the year and the 4th of her career. It was Wartusch's 1st title of the year and the 7th of her career.