| Singles | |
|---|---|
| 2018 Rio Open | |
| Champion |  Diego Schwartzman |
| Runner-up |  Fernando Verdasco |
| Score | 6–2, 6–3 |
| Draw | 32 (4 Q / 3 WC ) |
| Seeds | 8 |
Dominic Thiem was the defending champion, but lost in the quarterfinals to Fernando Verdasco.
Diego Schwartzman won the title, defeating Verdasco in the final, 6–2, 6–3.
Marin Čilić (second round)
Dominic Thiem (quarterfinals) Pablo Carreño Busta (second round) Albert Ramos Viñolas (second round)
Fabio Fognini (semifinals) Diego Schwartzman (champion)
Pablo Cuevas (quarterfinals) Fernando Verdasco (final)| Semifinals | Final | ||||||||||||
| 6 | Diego Schwartzman | 7 | 6 | ||||||||||
 Nicolás Jarry | 5 | 2 | |||||||||||
| 6 | Diego Schwartzman | 6 | 6 | ||||||||||
| 8 | Fernando Verdasco | 2 | 3 | ||||||||||
| 5 | Fabio Fognini | 1 | 5 | ||||||||||
| 8 | Fernando Verdasco | 6 | 7 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | M Čilić | 6 | 6 | ||||||||||||||||||||||||
| Q | C Berlocq | 3 | 2 | 1 | M Čilić | 3 | 68 | ||||||||||||||||||||
 G Monfils | 7 | 3 | 7 | G Monfils | 6 | 710 | |||||||||||||||||||||
| H Zeballos | 5 | 6 | 5 | G Monfils | 3 | 4 | |||||||||||||||||||||
 J Veselý | 2 | 2r | 6 | D Schwartzman | 6 | 6 | |||||||||||||||||||||
| F Delbonis | 6 | 3 | F Delbonis | 2 | 3 | ||||||||||||||||||||||
| WC |  C Ruud | 1r | 6 | D Schwartzman | 6 | 6 | |||||||||||||||||||||
| 6 | D Schwartzman | 4 | 6 | D Schwartzman | 7 | 6 | |||||||||||||||||||||
| 4 | A Ramos Viñolas | 6 | 3 | 6 | N Jarry | 5 | 2 | ||||||||||||||||||||
 R Dutra Silva | 3 | 6 | 4 | 4 | A Ramos Viñolas | 5 | 3 | ||||||||||||||||||||
| G García López | 3 | 63 | N Jarry | 7 | 6 | ||||||||||||||||||||||
| N Jarry | 6 | 77 | N Jarry | 7 | 6 | ||||||||||||||||||||||
| LL |  G Elias | 6 | 5 | 7 | 7 | P Cuevas | 5 | 3 | |||||||||||||||||||
| G Pella | 4 | 7 | 5 | LL | G Elias | 5 | 1 | ||||||||||||||||||||
| WC | T Monteiro | 77 | 610 | 3 | 7 | P Cuevas | 7 | 6 | |||||||||||||||||||
| 7 | P Cuevas | 65 | 712 | 6 | |||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | F Fognini | 65 | 7 | 6 | |||||||||||||||||||||||
| WC | T Bellucci | 77 | 5 | 2 | 5 | F Fognini | 4 | 6 | 78 | ||||||||||||||||||
| Q | R Carballés Baena | 6 | 1 | 3r |  T Sandgren | 6 | 4 | 66 | |||||||||||||||||||
| T Sandgren | 4 | 6 | 4 | 5 | F Fognini | 63 | 6 | 6 | |||||||||||||||||||
 A Bedene | 7 | 6 | A Bedene | 77 | 3 | 1 | |||||||||||||||||||||
| PR | A Haider-Maurer | 5 | 0 | A Bedene | 6 | 5 | 6 | ||||||||||||||||||||
| Q | M Cecchinato | 4 | 1 | 3 | P Carreño Busta | 2 | 7 | 2 | |||||||||||||||||||
| 3 | P Carreño Busta | 6 | 6 | 5 | F Fognini | 1 | 5 | ||||||||||||||||||||
| 8 | F Verdasco | 6 | 3 | 6 | 8 | F Verdasco | 6 | 7 | |||||||||||||||||||
| L Mayer | 2 | 6 | 3 | 8 | F Verdasco | 63 | 6 | 6 | |||||||||||||||||||
 V Estrella Burgos | 3 | 3 | N Kicker | 77 | 2 | 0 | |||||||||||||||||||||
| N Kicker | 6 | 6 | 8 | F Verdasco | 6 | 6 | |||||||||||||||||||||
| PR | P Andújar | 7 | 6 | 2 | D Thiem | 4 | 0 | ||||||||||||||||||||
| G Melzer | 5 | 2 | PR | P Andújar | 2r | ||||||||||||||||||||||
 D Lajović | 2 | 5 | 2 | D Thiem | 4 | ||||||||||||||||||||||
| 2 | D Thiem | 6 | 7 | ||||||||||||||||||||||||
Roberto Carballés Baena (qualified) Marco Cecchinato (qualified) Gastão Elias (qualifying competition, lucky loser) Carlos Berlocq (qualified) Pedro Sousa (first round) Corentin Moutet (qualified) Sebastian Ofner (first round) Alessandro Giannessi (qualifying competition) Roberto Carballés Baena Marco Cecchinato Corentin Moutet (withdrew due to a right knee injury) Carlos Berlocq | First round | Qualifying competition | ||||||||||||
| 1 | Roberto Carballés Baena | 4 | 6 | 3 | |||||||||
| Carlos Taberner | 6 | 1 | 0r | ||||||||||
| 1 | Roberto Carballés Baena | 6 | 6 | ||||||||||
| 8 | Alessandro Giannessi | 3 | 2 | ||||||||||
| Guilherme Clezar | 77 | 4 | 3 | ||||||||||
| 8 | Alessandro Giannessi | 63 | 6 | 6 | |||||||||
| First round | Qualifying competition | ||||||||||||
| 2 | Marco Cecchinato | 6 | 6 | ||||||||||
| João Domingues | 3 | 2 | |||||||||||
| 2 | Marco Cecchinato | 711 | 6 | ||||||||||
| Renzo Olivo | 69 | 2 | |||||||||||
| Renzo Olivo | 6 | 6 | |||||||||||
| 5 | Pedro Sousa | 4 | 3 | ||||||||||
| First round | Qualifying competition | ||||||||||||
| 3 | Gastão Elias | 6 | 6 | ||||||||||
| WC | José Pereira | 4 | 2 | ||||||||||
| 3 | Gastão Elias | 2 | 78 | 4 | |||||||||
| 6 | Corentin Moutet | 6 | 66 | 6 | |||||||||
| WC | Thiago Seyboth Wild | 2 | 0 | ||||||||||
| 6 | Corentin Moutet | 6 | 6 | ||||||||||
| First round | Qualifying competition | ||||||||||||
| 4 | Carlos Berlocq | 6 | 7 | ||||||||||
| WC | João Souza | 1 | 5 | ||||||||||
| 4 | Carlos Berlocq | 6 | 77 | ||||||||||
| Tommy Robredo | 4 | 63 | |||||||||||
| Tommy Robredo | 5 | 6 | 6 | ||||||||||
| 7 | Sebastian Ofner | 7 | 2 | 1 | |||||||||
Fabio Fognini was the defending champion, but lost to Filip Krajinović in the second round.
Leonardo Mayer won the title, defeating David Ferrer in the final, 6–7(3–7), 6–1, 7–6(7–4).
Dominic Thiem defeated Nicolás Almagro in the final, 7–6(7–2), 3–6, 7–6(7–4). He saved a match point en route to the title, in the semifinals against defending champion Rafael Nadal.
Federico Delbonis was the defending champion but chose not to participate.
Pablo Cuevas was the defending champion, but lost in the first round to Arthur De Greef.
Pablo Cuevas was the two-time defending champion and successfully defended his title, defeating Albert Ramos Viñolas in the final, 6–7(3–7), 6–4, 6–4.
Christian Garín was the defending champion but lost in the second round to Gastão Elias.
Nicolás Kicker was the defending champion but lost in the quarterfinals to Facundo Bagnis.
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.
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Dominic Thiem was the defending champion, but lost to Diego Schwartzman in the semifinals.
Diego Schwartzman was the defending champion, but he retired in the first round against Pablo Cuevas.
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Carlos Alcaraz defeated Diego Schwartzman in the final, 6–4, 6–2 to win the singles title at the 2022 Rio Open. Alcaraz became the youngest winner of an ATP Tour 500 event since the category was created in 2009.
Zdeněk Kolář was the defending champion but chose not to defend his title.