2017 Estoril Open

The 2017 Estoril Open (also known as the Millennium Estoril Open for sponsorship purposes) was a professional men's tennis tournament played on outdoor clay courts. It was the third edition of the Estoril Open, and part of the ATP World Tour 250 series of the 2017 ATP World Tour. The event took place at the Clube de Ténis do Estoril in Cascais, Portugal, from 29 April to 7 May 2017.

Seeds

 * Rankings are as of April 24, 2017.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇪🇸 David Ferrer
 * Frederico Ferreira Silva
 * Pedro Sousa

The following players received entry using a protected ranking into the singles main draw:
 * 🇪🇸 Tommy Robredo

The following players received entry from the qualifying draw:
 * 🇮🇹 Salvatore Caruso
 * João Domingues
 * 🇺🇸 Bjorn Fratangelo
 * 🇸🇪 Elias Ymer

Withdrawals

 * Before the tournament
 * 🇦🇷 Federico Delbonis →replaced by 🇪🇸 Guillermo García López
 * 🇦🇺 Nick Kyrgios →replaced by 🇦🇷 Renzo Olivo
 * 🇷🇺 Daniil Medvedev →replaced by 🇷🇺 Evgeny Donskoy
 * 🇦🇷 Juan Mónaco →replaced by Gastão Elias
 * 🇯🇵 Yoshihito Nishioka →replaced by Kevin Anderson
 * 🇪🇸 Albert Ramos Viñolas →replaced by 🇯🇵 Yūichi Sugita


 * During the tournament
 * 🇦🇷 Juan Martín del Potro

Seeds

 * Rankings are as of April 24, 2017.

Other entrants
The following pairs received wildcards into the doubles main draw:
 * Felipe Cunha-Silva / Fred Gil
 * Gastão Elias / Frederico Ferreira Silva

Singles

 * 🇪🇸 Pablo Carreño Busta def. 🇱🇺 Gilles Müller, 6–2, 7–6(7–5)

Doubles

 * 🇺🇸 Ryan Harrison / 🇳🇿 Michael Venus def. 🇪🇸 David Marrero / 🇪🇸 Tommy Robredo, 7–5, 6–2