2019 Estoril Open

The 2019 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 fifth edition of the Estoril Open, and part of the ATP Tour 250 series of the 2019 ATP Tour. The event took place at the Clube de Ténis do Estoril in Cascais, Portugal, from April 29 through May 5, 2019.

Seeds

 * Rankings are as of April 22, 2019.

Other entrants
The following players received wildcards into the singles main draw:
 * 🇪🇸 Pablo Carreño Busta
 * 🇧🇪 David Goffin
 * Pedro Sousa

The following player received entry as a special exempt:
 * 🇷🇸 Filip Krajinović

The following players received entry from the qualifying draw:
 * 🇮🇹 Salvatore Caruso
 * 🇪🇸 Alejandro Davidovich Fokina
 * João Domingues
 * 🇦🇺 Alexei Popyrin

The following players received entry as lucky losers:
 * 🇮🇹 Filippo Baldi
 * Pablo Cuevas

Withdrawals

 * Kevin Anderson → replaced by 🇧🇴 Hugo Dellien
 * 🇷🇸 Filip Krajinović → replaced by Pablo Cuevas
 * 🇮🇹 Fabio Fognini → replaced by 🇮🇹 Filippo Baldi
 * 🇪🇸 Jaume Munar → replaced by Nicolás Jarry
 * 🇬🇧 Cameron Norrie → replaced by 🇦🇷 Guido Andreozzi

Retirements

 * 🇦🇺 John Millman

Seeds

 * Rankings are as of April 22, 2019.

Other entrants
The following pairs received wildcards into the doubles main draw:
 * João Domingues / 🇪🇸 Pedro Martínez
 * Gastão Elias / Pedro Sousa

The following pairs received entry as alternates:
 * 🇦🇷 Guido Andreozzi / 🇧🇴 Hugo Dellien
 * Tiago Cação / Fred Gil

Withdrawals

 * Before the tournament
 * 🇦🇺 John Millman (Left foot injury)
 * Pedro Sousa (Left foot injury)
 * During the tournament
 * 🇺🇸 Reilly Opelka (Back pain)

Singles

 * Stefanos Tsitsipas def. Pablo Cuevas, 6–3, 7–6(7–4)

Doubles

 * 🇫🇷 Jérémy Chardy / 🇫🇷 Fabrice Martin def. 🇬🇧 Luke Bambridge / 🇬🇧 Jonny O'Mara, 7–5, 7–6(7–3)