The 2018 Rio Open was a professional men's tennis tournament played on outdoor clay courts. It was the 5th edition of the tournament, and part of the ATP World Tour 500 series of the 2018 ATP World Tour. It took place in Rio de Janeiro, Brazil between February 19–25, 2018.
See main article: 2018 Rio Open – Singles.
Diego Schwartzman defeated 
Fernando Verdasco, 6–2, 6–3See main article: 2018 Rio Open – Doubles.
David Marrero / Fernando Verdasco defeated Nikola Mektić / 
Alexander Peya, 5–7, 7–5, [10–8]| Event | W | F | SF | QF | Round of 16 | Round of 32 | width=85 | Q | width=85 | Q2 | width=85 | Q1 |
| Singles | 500 | 300 | 180 | 90 | 45 | 0 | 20 | 10 | 0 | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubles | 0 | 45 | 25 | |||||||||
| Event | W | F | SF | QF | Round of 16 | Round of 321 | width=85 | Q2 | width=85 | Q1 |
| Singles | $314,880 | $154,370 | $77,680 | $39,500 | $20,515 | $10,820 | $2,395 | $1,220 | ||
| Doubles | $94,800 | $46,410 | $23,280 | $11,950 | $6,180 | |||||
| Doubles prize money per team | ||||||||||
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Marin Čilić | 3 | 1 | ||
| Austria | Dominic Thiem | 6 | 2 | |
| Spain | Pablo Carreño Busta | 10 | 3 | |
| Spain | Albert Ramos Viñolas | 20 | 4 | |
 Italy | Fabio Fognini | 22 | 5 | |
| Argentina | Diego Schwartzman | 24 | 6 | |
| Pablo Cuevas | 32 | 7 | ||
| Spain | Fernando Verdasco | 40 | 8 |
The following players received wildcards into the singles main draw:
The following players received entry using a protected ranking:
The following players received entry from the qualifying draw:
The following player received entry as a lucky loser:
Alexandr Dolgopolov → replaced by 
Tennys Sandgren
Kyle Edmund → replaced by Pablo Andújar Paolo Lorenzi → replaced by Gerald Melzer
Corentin Moutet → replaced by Gastão Elias Nicolás Kicker| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
 Poland | Łukasz Kubot |  Brazil | Marcelo Melo | 2 | 1 | |
| United Kingdom | Jamie Murray | Brazil | Bruno Soares | 19 | 2 | |
 Colombia | Juan Sebastián Cabal | Colombia | Robert Farah | 35 | 3 | |
 Mexico | Santiago González | Julio Peralta | 57 | 4 |
The following pairs received wildcards into the doubles main draw:
The following pair received entry from the qualifying draw:
The following pair received entry as lucky losers:
