Juan Martín del Potro was the two-time defending champion but chose not to defend his title.
Fabio Fognini defeated Dušan Lajović in the final, 6–3, 6–4 to win the singles title at the 2019 Monte-Carlo Masters. It was his first ATP Tour Masters 1000 title.
Players who neither have high enough rankings nor receive wild cards may participate in a qualifying tournament held one week before the annual Wimbledon Tennis Championships.
The 2019 Stockholm Open was a professional men's tennis tournament played on indoor hard courts. It was the 51st edition of the tournament, and part of the ATP Tour 250 series of the 2019 ATP Tour. It took place at the Kungliga tennishallen in Stockholm, Sweden from 14 to 20 October 2019. Fourth-seeded Denis Shapovalov won the singles title.
Gaël Monfils was the defending champion and successfully defended his title, defeating Félix Auger-Aliassime in the final, 6–2, 6–4.
Stefanos Tsitsipas was the defending champion and successfully defended his title, defeating Félix Auger-Aliassime in the final, 6–3, 6–4.
Roger Federer was the defending champion, but withdrew from the tournament after undergoing surgery on his right knee.
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.
First seed Alexander Zverev won the tournament, defeating second seed Diego Schwartzman 6–2, 6–1 in the final. This was the first edition of the tournament, primarily organised due to the cancellation of many tournaments in 2020, due to the COVID-19 pandemic.
Fourth seed John Millman won his first ATP Tour title, defeating third seed Adrian Mannarino in the final, 7–5, 6–1. This was the first edition of the tournament, primarily organised due to the cancellation of many tournaments during the 2020 season, because of the ongoing COVID-19 pandemic.
Stefanos Tsitsipas defeated Andrey Rublev in the final, 6–3, 6–3 to win the singles tennis title at the 2021 Monte-Carlo Masters. It was his first ATP Tour Masters 1000 title, making him the first Greek man to win a tournament at this level. Rublev was also in contention for his maiden Masters 1000 title.
Matteo Berrettini defeated Aslan Karatsev in the final, 6–1, 3–6, 7–6(7–0), to win the men's singles tennis title at the 2021 Serbia Open.
Alexander Zverev defeated Matteo Berrettini in the final, 6–7(8–10), 6–4, 6–3 to win the men's singles tennis title at the 2021 Madrid Open. It was Zverev's fourth ATP Masters 1000 title, his first since winning Madrid in 2018, and his 15th career ATP Tour singles title overall. Berrettini was in contention to become the second Italian to be crowned a Masters 1000 champion in his first final at this level.
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.
Daniil Medvedev won the title, defeating Reilly Opelka in the final, 6–4, 6–3. It was his fourth ATP Masters 1000 title and 12th career title.
Alexander Zverev defeated Andrey Rublev in the final, 6–2, 6–3 to win the men's singles title at the 2021 Cincinnati Masters. It was his fifth ATP Tour Masters 1000 title and 17th career singles title on the ATP Tour.
Andrey Rublev was the defending champion, but chose to compete in St. Petersburg instead.
Novak Djokovic defeated the defending champion Daniil Medvedev in the final, 4–6, 6–3, 6–3 to win the singles title at the 2021 Paris Masters. It was his record-extending sixth Paris Masters title and record-breaking 37th ATP Tour Masters 1000 title overall, breaking a tie with Rafael Nadal in the latter category.
Andrey Rublev defeated Jiří Veselý in the final, 6–3, 6–4 to win the men's singles title at the 2022 Dubai Tennis Championships. It was Rublev's tenth career singles title. Veselý entered the tournament ranked as the world No. 123, and was the lowest-ranked finalist in the tournament's history.
Carlos Alcaraz defeated Pablo Carreño Busta in the final, 6–3, 6–2 to win the singles tennis title at the 2022 Barcelona Open. Alcaraz saved two match points in his semifinal match against Alex de Minaur. With the win, Alcaraz entered the top 10 in rankings for the first time in his career, becoming the youngest man to do so since Rafael Nadal in 2005.
Denis Shapovalov 
Filip Krajinović 
