Pablo Cuevas was the last edition champion, but he chose to defend another of his previous title in Båstad which was held simultaneously with the Croatia Open Umag this year.
Roberto Bautista Agut was the defending champion, but withdrew due to a stomach virus.
Roberto Bautista Agut was the defending champion, but lost in the semifinals to David Goffin.
This was the first edition of the tournament.
Grigor Dimitrov defeated Nick Kyrgios in the final, 6–3, 7–5, to win the 2017 Cincinnati Masters. It was his first ATP World Tour Masters 1000 title, and he did not lose a set throughout the tournament.
Pablo Carreño Busta was the defending champion, but lost in the second round to Julien Benneteau.
Santiago Giraldo was the defending champion but chose not to defend his title.
Juan Martín del Potro defeated the defending champion Roger Federer in the final, 6–4, 6–7(8–10), 7–6(7–2) to win the men's singles tennis title at the 2018 Indian Wells Masters. Del Potro saved three championship points en route to his first ATP Tour Masters 1000 title, having been a runner-up on three previous occasions.
Two-time defending champion Rafael Nadal successfully defended his title, defeating Kei Nishikori in the final, 6–3, 6–2, to win the singles title at the 2018 Monte-Carlo Masters. It was his record-extending 11th Monte-Carlo Masters title and his record 31st ATP Masters title. By winning the title, Nadal also retained the ATP no. 1 singles ranking.
Rafael Nadal defeated Stefanos Tsitsipas in the final, 6–2, 7–6(7–4), to win the men's singles tennis title at the 2018 Rogers Cup. It was his fourth Rogers Cup title.
Roger Federer was the defending champion and successfully defended his title, defeating Marius Copil in the final, 7–6(7–5), 6–4.
The 2019 Auckland Open was a joint ATP and WTA tennis tournament, played on outdoor hard courts. It was the 34th edition of the women's event, and the 43rd edition of the men's event. It took place at the ASB Tennis Centre in Auckland, New Zealand, from 31 December 2018 to 6 January 2019 for the women, and from 7 to 12 January 2019 for the men.
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.
Nikoloz Basilashvili was the defending champion, but lost in the second round to Stefanos Tsitsipas.
Novak Djokovic defeated Milos Raonic in the final, 1–6, 6–3, 6–4, to win the men's singles title at the 2020 Cincinnati Masters. With the win, he claimed his record-equaling 35th ATP Masters 1000 title, and completed the career Golden Masters for a second time. Djokovic became the first new singles titlist on the ATP Tour since its suspension due to the COVID-19 pandemic in March 2020.
Nikoloz Basilashvili was the two-time defending champion, but lost in the first round to Roberto Bautista Agut.
Rafael Nadal defeated the defending champion Novak Djokovic in the final, 7–5, 1–6, 6–3 to win the men's singles tennis title at the 2021 Italian Open. It was his record-extending 10th Italian Open title and record-equaling 36th Masters 1000 title overall. Nadal saved two match points in his third round match against Denis Shapovalov en route to the title. This was also the fourth time that Nadal had won a tournament on 10 or more occasions, making him the only tennis player with the feat.
Casper Ruud defeated Hugo Gaston in the final, 6–3, 6–2, to win the men's singles tennis title at the 2021 Swiss Open.
Miomir Kecmanović was the defending champion, but chose to compete at the Summer Olympics instead.
Novak Djokovic defeated Stefanos Tsitsipas in the final, 6–0, 7–6(7–5) to win the men's singles tennis title at the 2022 Italian Open. It was his sixth Italian Open title and record-extending 38th Masters 1000 title overall. Djokovic did not lose a set during the tournament, and won his 1000th tour-level career match by reaching the final. It was the first title he won in 2022.
Tennys Sandgren 
Cameron Norrie 
