2018 Estoril Open
{{TennisEventInfo|2018|Estoril Open|
| date=30 April – 6 May
| edition=4th
| draw=28S / 16D
| surface=Clay
| prize_money=€501,345
| location=Cascais, Portugal
| venue=Clube de Ténis do Estoril
| champs={{flagicon|POR}} João Sousa
| champd={{flagicon|GBR}} Kyle Edmund / {{flagicon|GBR}} Cameron Norrie
| main_name=Estoril Open (tennis)
}}
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.
Singles main-draw entrants
=Seeds=
| class=wikitable |
| style="background:#cfc;"
! width="70"| Country ! width="175"| Player ! Rank1 ! Seed |
| {{flag|RSA}}
|8 |1 |
| {{flag|ESP}}
|11 |2 |
| {{flag|GBR}}
|23 |3 |
| {{flag|LUX}}
|28 |4 |
| {{flag|ESP}}
|40 |5 |
| {{flag|NED}}
|44 |6 |
| {{flag|ARG}}
|45 |7 |
| {{flag|RUS}}
|48 |8 |
- Rankings are as of April 23, 2018.
=Other entrants=
The following players received wildcards into the singles main draw:
- {{flagicon|AUS}} Alex de Minaur
- {{flagicon|POR}} Frederico Ferreira Silva
- {{flagicon|POR}} Pedro Sousa
The following players received entry from the qualifying draw:
- {{flagicon|ITA}} Simone Bolelli
- {{flagicon|POR}} João Domingues
- {{flagicon|ESP}} Ricardo Ojeda Lara
- {{flagicon|USA}} Tim Smyczek
=Withdrawals=
;Before the tournament
- {{flagicon|ESP}} David Ferrer → replaced by {{flagicon|GBR}} Cameron Norrie
- {{flagicon|AUS}} Nick Kyrgios → replaced by {{flagicon|ARG}} Nicolás Kicker
- {{flagicon|FRA}} Benoît Paire → replaced by {{flagicon|POR}} Gastão Elias
Doubles main-draw entrants
=Seeds=
| class="sortable wikitable" |
| width="70"| Country
! width="175"| Player ! width="70"| Country ! width="175"| Player ! Rank1 ! Seed |
|---|
| {{flag|AUS}}
|{{flag|NED}} |17 |1 |
| {{flag|RSA}}
|{{flag|NZL}} |48 |2 |
| {{flag|ESP}}
|{{flag|ESP}} |67 |3 |
| {{flag|BRA}}
|{{flag|MEX}} |84 |4 |
- Rankings are as of April 23, 2018.
=Other entrants=
The following pairs received wildcards into the doubles main draw:
- {{flagicon|AUS}} Alex de Minaur / {{flagicon|AUS}} Lleyton Hewitt
- {{flagicon|POR}} Gastão Elias / {{flagicon|POR}} Pedro Sousa
Champions
=Singles=
{{main|2018 Estoril Open – Singles}}
- {{flagicon|POR}} João Sousa def. {{flagicon|USA}} Frances Tiafoe, 6–4, 6–4
=Doubles=
{{main|2018 Estoril Open – Doubles}}
- {{flagicon|GBR}} Kyle Edmund / {{flagicon|GBR}} Cameron Norrie def. {{flagicon|NED}} Wesley Koolhof / {{flagicon|NZL}} Artem Sitak, 6–4, 6–2
References
{{Reflist}}