| 2018 Estoril Open | ||||
|---|---|---|---|---|
| Date | 30 April – 6 May | |||
| Edition | 4th | |||
| Draw | 28S / 16D | |||
| Prize money | €501,345 | |||
| Surface | Clay | |||
| Location | Cascais, Portugal | |||
| Venue | Clube de Ténis do Estoril | |||
| Champions | ||||
| Singles | ||||
 João Sousa | ||||
| Doubles | ||||
 Kyle Edmund /Cameron Norrie | ||||
| ||||
The2018 Estoril Open (also known as theMillennium Estoril Open for sponsorship purposes) was a professional men'stennis tournament played onoutdoor clay courts. It was the fourth edition of theEstoril Open, and part of theATP World Tour 250 series of the2018 ATP World Tour. The event took place at the Clube de Ténis do Estoril inCascais, Portugal, from April 30 through May 6, 2018.
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 RSA | Kevin Anderson | 8 | 1 |
 ESP | Pablo Carreño Busta | 11 | 2 |
| GBR | Kyle Edmund | 23 | 3 |
 LUX | Gilles Müller | 28 | 4 |
| ESP | Albert Ramos Viñolas | 40 | 5 |
 NED | Robin Haase | 44 | 6 |
 ARG | Leonardo Mayer | 45 | 7 |
 RUS | Daniil Medvedev | 48 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
David Ferrer → replaced byCameron Norrie
Nick Kyrgios → replaced byNicolás Kicker
Benoît Paire → replaced byGastão Elias| Country | Player | Country | Player | Rank1 | Seed |
|---|---|---|---|---|---|
| AUS | John Peers | NED | Jean-Julien Rojer | 17 | 1 |
| RSA | Raven Klaasen |  NZL | Michael Venus | 48 | 2 |
| ESP | Marc López | ESP | David Marrero | 67 | 3 |
 BRA | Marcelo Demoliner |  MEX | Santiago González | 84 | 4 |
The following pairs received wildcards into the doubles main draw:
João Sousa def.
Frances Tiafoe, 6–4, 6–4Kyle Edmund /Cameron Norrie def.Wesley Koolhof /Artem Sitak, 6–4, 6–2