| 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 | ||||
| ||||
The 2018 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 fourth edition of the Estoril Open, and part of the ATP World Tour 250 series of the 2018 ATP World Tour. The event took place at the Clube de Ténis do Estoril in Cascais, 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 by Cameron Norrie
Nick Kyrgios → replaced by Nicolás Kicker
Benoît Paire → replaced by Gastão 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, 6–4 Kyle Edmund / Cameron Norrie def. Wesley Koolhof / Artem Sitak, 6–4, 6–2|
2019 » | |
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| Grand Slam events |
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| ATP World Tour Masters 1000 |
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| ATP World Tour 500 series |
|
| ATP World Tour 250 series |
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| Team events |
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