| Singles | |
|---|---|
| 2018 Open du Pays d'Aix | |
| Champion |  John Millman |
| Runner-up | Bernard Tomic |
| Final score | 6–1, 6–2 |
Frances Tiafoe was the defending champion but chose not to defend his title.
John Millman won the title after defeating Bernard Tomic 6–1, 6–2 in the final.
John Millman (champion)
Jérémy Chardy (first round)
Radu Albot (first round)
Cameron Norrie (second round) Calvin Hemery (first round)
Peter Polansky (first round)
Sergiy Stakhovsky (first round)
Thiago Monteiro (quarterfinals)| Semifinals | Final | ||||||||||||
| 1 | John Millman | 69 | 6 | 7 | |||||||||
 Guido Andreozzi | 711 | 2 | 5 | ||||||||||
| 1 | John Millman | 6 | 6 | ||||||||||
| Bernard Tomic | 1 | 2 | |||||||||||
 Elias Ymer | 6 | 62 | 4 | ||||||||||
| Bernard Tomic | 2 | 77 | 6 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | J Millman | 6 | 5 | 6 | |||||||||||||||||||||||
| Q | A Popyrin | 2 | 7 | 2 | 1 | J Millman | 6 | 6 | |||||||||||||||||||
 S Kozlov | 62 | 4 | C Lestienne | 2 | 2 | ||||||||||||||||||||||
| C Lestienne | 77 | 6 | 1 | J Millman | 6 | 6 | |||||||||||||||||||||
 O Otte | 2 | 6 | 6 | O Otte | 4 | 0 | |||||||||||||||||||||
| Q | S Diez | 6 | 2 | 3 | O Otte | 4 | 6 | 6 | |||||||||||||||||||
 S Ofner | 3 | 6 | 7 | S Ofner | 6 | 3 | 2 | ||||||||||||||||||||
| 7 | S Stakhovsky | 6 | 2 | 5 | 1 | J Millman | 69 | 6 | 7 | ||||||||||||||||||
| 3 | R Albot | 6 | 3 | 4 | G Andreozzi | 711 | 2 | 5 | |||||||||||||||||||
| G Andreozzi | 3 | 6 | 6 | G Andreozzi | 6 | 6 | |||||||||||||||||||||
| WC | A Müller | 2 | 2 | Q | M González | 1 | 2 | ||||||||||||||||||||
| Q | M González | 6 | 6 | G Andreozzi | 79 | 77 | |||||||||||||||||||||
 A Bublik | 65 | 64 | 8 | T Monteiro | 67 | 62 | |||||||||||||||||||||
| B Klahn | 77 | 77 | B Klahn | 5 | 4 | ||||||||||||||||||||||
| M Moraing | 2 | 3 | 8 | T Monteiro | 7 | 6 | |||||||||||||||||||||
| 8 | T Monteiro | 6 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | C Hemery | 62 | 2 | ||||||||||||||||||||||||
| SE |  N Serdarušić | 77 | 6 | SE | N Serdarušić | 6 | 6 | ||||||||||||||||||||
 N Gombos | 6 | 77 | N Gombos | 4 | 4 | ||||||||||||||||||||||
 T Robredo | 2 | 64 | SE | N Serdarušić | 5 | 3 | |||||||||||||||||||||
| B Bonzi | 4 | 2 | E Ymer | 7 | 6 | ||||||||||||||||||||||
| E Ymer | 6 | 6 | E Ymer | 2 | 6 | 7 | |||||||||||||||||||||
| K de Schepper | 6 | 2 | 1 | 4 | C Norrie | 6 | 3 | 5 | |||||||||||||||||||
| 4 | C Norrie | 1 | 6 | 6 | E Ymer | 6 | 62 | 4 | |||||||||||||||||||
| 6 | P Polansky | 5 | 7 | 3 | B Tomic | 2 | 77 | 6 | |||||||||||||||||||
| WC | J Tatlot | 7 | 5 | 6 | WC | J Tatlot | 4 | 1 | |||||||||||||||||||
| B Tomic | 6 | 2 | 7 | B Tomic | 6 | 6 | |||||||||||||||||||||
| WC | G Blancaneaux | 4 | 6 | 5 | B Tomic | 6 | 6 | ||||||||||||||||||||
| Q |  G Mager | 7 | 79 | Q | G Mager | 3 | 4 | ||||||||||||||||||||
 E Gulbis | 5 | 67 | Q | G Mager | 6 | 3 | 6 | ||||||||||||||||||||
| WC | E Benchetrit | 6 | 6 | WC | E Benchetrit | 4 | 6 | 1 | |||||||||||||||||||
| 2 | J Chardy | 3 | 2 | ||||||||||||||||||||||||
Danai Udomchoke was the defending champion but decided not to participate.
John Millman defeated Stéphane Robert 6–2, 4–6, 6–0 in the final to win the title.
Philipp Kohlschreiber was the defending champion but lost in the final to Tommy Haas, 3–6, 6–7(3–7).
Novak Djokovic was the three-time defending champion and successfully defended his title, defeating Rafael Nadal in the final, 6–2, 6–2. It was his 6th title in Beijing and brought his record at the tournament to 29–0.
Three-time defending champion Kei Nishikori successfully defended his title, defeating Taylor Fritz in the final, 6–4, 6–4 to win the singles title at the 2016 Memphis Open. Notably, this was only Fritz' third career event on the ATP Tour.
Andy Murray was the defending champion and successfully defended his title, defeating Milos Raonic in the final, 6–7(5–7), 6–4, 6–3. This was Murray's fifth title at Queen's, an all-time record. This would be the first of two consecutive ATP finals on grass between Murray and Raonic as the two players also met in the final of Wimbledon, three weeks later, with Murray again prevailing to win his second Wimbledon title.
Marin Čilić defeated Andy Murray in the final, 6–4, 7–5, to win the men's singles title at the 2016 Cincinnati Masters. It was his maiden Masters 1000 title, ending a streak of 18 consecutive Masters events won by a member of the Big Four.
Novak Djokovic was the four-time defending champion, but withdrew with an elbow injury before the tournament began.
Ernesto Escobedo was the defending champion but chose not to defend his title.
Jordan Thompson was the defending champion but chose not to defend his title.
Yūichi Sugita was the defending champion but chose not to defend his title.
Yasutaka Uchiyama was the defending champion but lost in the first round to Michał Przysiężny.
Lucas Pouille was the defending champion, but lost in the second round to John Millman.
Jo-Wilfried Tsonga was the defending champion, but due to injury did not defend his title.
Feliciano López was the defending champion, but lost in the quarterfinals to Nick Kyrgios.
Kevin Anderson was the defending champion, but withdrew before the tournament began because of a right elbow injury.
Defending champion Rafael Nadal successfully defended his title, defeating Daniil Medvedev in the final, 6–3, 6–0, to win the men's singles title at the 2019 Canadian Open. This was the first time Nadal defended a hardcourt title.
Daniil Medvedev was the defending champion, but chose not to defend his title.
Lorenzo Sonego defeated defending champion Laslo Đere in the final, 2–6, 7–6(7–5), 6–4 to win the men's singles title at the 2021 Sardegna Open. With the victory, Sonego became the first Italian in 15 years to capture an ATP Tour title on home soil.
John Millman was the defending champion, but lost in the quarterfinals to James Duckworth.
Jannik Sinner was the defending champion and successfully defended his title, defeating Gaël Monfils in the final, 6–3, 6–4.