| Date: | 23–29 April |
| Edition: | 66th |
| Draw: | 48 / 16 |
| Category: | ATP World Tour 500 |
| Surface: | Clay |
| Prize Money: | €2,324,905 |
| Location: | Barcelona, Spain |
| Venue: | Real Club de Tenis Barcelona |
| Champs: |  Rafael Nadal |
| Champd: | Feliciano López / Marc López |
| Main Name: | Barcelona Open (tennis) Barcelona Open |
The 2018 Barcelona Open Banc Sabadell, also known as the Torneo Conde de Godó, was a men's tennis tournament played on outdoor clay courts. It was the 66th edition of the event and part of the ATP World Tour 500 series of the 2018 ATP World Tour. It took place at the Real Club de Tenis Barcelona in Barcelona, Catalonia, Spain, from 23 April until 29 April 2018. First-seeded Rafael Nadal won the singles title.
| Event | W | F | SF | QF | Round of 16 | Round of 32 | Round of 64 | width=85 | Q | width=85 | Q2 | width=85 | Q1 |
| Singles[1] | 500 | 300 | 180 | 90 | 45 | 20 | 0 | 10 | 4 | 0 | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubles | 0 | 45 | 25 |
| width=130 bgcolor=ededed | Event | width=80 bgcolor=lime | W | width=85 bgcolor=thistle | F | width=85 bgcolor=ffff00 | SF | width=85 bgcolor=ffebcd | QF | width=85 bgcolor=afeeee | Round of 16 | width=85 bgcolor=afeeee | Round of 32 | width=85 bgcolor=afeeee | Round of 64 | width=85 | Q2 | width=85 | Q1 |
| style=background:#f3f3f3 | Singles | € | € | € | € | € | € | € | € | € | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| style=background:#f3f3f3 | Doubles | € | € | € | € | € |
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Spain | Rafael Nadal | 1 | 1 | |
| Grigor Dimitrov | 5 | 2 | ||
 Austria | Dominic Thiem | 7 | 3 | |
 Belgium | David Goffin | 10 | 4 | |
| Spain | Pablo Carreño Busta | 12 | 5 | |
 Serbia | Novak Djokovic | 13 | 6 | |
 Argentina | Diego Schwartzman | 15 | 7 | |
| Spain | Roberto Bautista Agut | 16 | 8 | |
 Korea, Republic of | ||||
| Spain | Albert Ramos Viñolas | 24 | 10 | |
 France | Adrian Mannarino | 26 | 11 | |
| Spain | 30 | 12 | ||
 Russian Federation | ||||
 Japan | Kei Nishikori | 36 | 14 | |
| Spain | ||||
| Russian Federation | Karen Khachanov | 38 | 16 |
The following players received wildcards into the main draw:
The following players received entry using a protected ranking:
The following players received entry from the qualifying draw:
The following players received entry as lucky losers:
Malek Jaziri Chung Hyeon → replaced by Pablo Andújar David Ferrer → replaced by Dušan Lajović Alexey Vatutin Andrey Rublev → replaced by 
Ernesto Escobedo Fernando Verdasco → replaced by 
Jozef Kovalík Horacio Zeballos → replaced by João Sousa| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
 Poland | Łukasz Kubot |  Brazil | Marcelo Melo | 2 | 1 | |
 Finland | Henri Kontinen |  Australia | John Peers | 7 | 2 | |
| Austria | Oliver Marach | Mate Pavić | 11 | 3 | ||
The following pairs received wildcards into the doubles main draw:
The following pair received entry from the qualifying draw:
The following pairs entered as lucky losers:
See main article: 2018 Barcelona Open Banco Sabadell – Singles.
Rafael Nadal defeated Stefanos Tsitsipas, 6–2, 6–1See main article: 2018 Barcelona Open Banco Sabadell – Doubles.
Feliciano López / Marc López defeated 
Aisam-ul-Haq Qureshi / Jean-Julien Rojer, 7–6(7–5), 6–4