Jo-Wilfried Tsonga was the defending champion, but withdrew before the tournament began with a left hamstring injury.
Two-time defending champion Rafael Nadal defeated Stefanos Tsitsipas in the final, 6–2, 6–1 to win the singles tennis title at the 2018 Barcelona Open. With the win, Nadal retained the ATP no. 1 singles ranking. It was Nadal's record-extending eleventh Barcelona Open title and his 20th ATP 500 title overall, equaling Roger Federer's record. It was Tsitsipas' maiden ATP Tour final.
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 Canadian Open title.
The 2019 Dubai Tennis Championships was an ATP Tour 500 event on the 2019 ATP Tour and a WTA Premier 5 event on the 2019 WTA Tour. Both events were held at the Aviation Club Tennis Centre in Dubai, United Arab Emirates. The women's tournament took place from 17 to 23 February and the men's tournament from 25 February–2 March.
Roger Federer was the defending champion, but chose not to participate this year.
Dominic Thiem defeated Roger Federer in the final, 3–6, 6–3, 7–5 to win the men's singles tennis title at the 2019 Indian Wells Masters. It was his maiden ATP Tour Masters 1000 title, and he became the first Austrian to win a Masters title since Thomas Muster won the 1997 Miami Open.
This was the first edition of the tournament.
Roger Federer was the two-time defending champion and successfully defended his title, defeating Alex de Minaur in the final, 6–2, 6–2. He did not lose a single set in the entire tournament. The victory made Federer the first player in ATP history to win 10 same tournament titles on two different surfaces. It was his 103rd and final ATP title before announcing his retirement in 2022.
Novak Djokovic defeated Denis Shapovalov in the final, 6–3, 6–4 to win the singles tennis title at the 2019 Paris Masters. It was his record-extending fifth Paris Masters title, and he did not drop a set en route.
Kevin Anderson was the defending champion, but chose not to participate this year.
Novak Djokovic defeated Milos Raonic in the final, 1–6, 6–3, 6–4 to win the men's singles tennis title at the 2020 Cincinnati Masters. With the win, he claimed his record-equaling 35th Masters 1000 title, and completed the double career Golden Masters. 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.
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 to win a Masters tournament. Rublev was also in contention for his maiden Masters 1000 title.
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 en route to the title, in his third round match against Denis Shapovalov. 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.
The 2021 Halle Open was a tennis tournament played on outdoor grass courts. It was the 28th edition of the Halle Open and part of the ATP Tour 500 series of the 2021 ATP Tour. It took place at the OWL Arena in Halle, Germany, between 14 and 20 June 2021.
Ugo Humbert defeated Andrey Rublev in the final 6–3, 7–6(7–4), to win the singles tennis title at the 2021 Halle Open. Humbert's win earned him his third career ATP Tour singles title and his first ATP 500 victory, and also made him the first French player to win the tournament since Henri Leconte won the inaugural edition in 1993. Both Humbert and Rublev were contesting their first career final on grass.
Alexander Zverev defeated Andrey Rublev in the final, 6–2, 6–3 to win the men's singles tennis title at the 2021 Cincinnati Masters. It was his fifth Masters 1000 title and 17th career singles title on the ATP Tour.
Andrey Rublev was the reigning champion from when the tournament was last held in 2019, but lost to Adrian Mannarino in the second round in a rematch of the 2019 final.
Félix Auger-Aliassime defeated Stefanos Tsitsipas in the final, 6–4, 6–2. It was his maiden ATP Tour singles title, following eight runner-up finishes in prior finals.
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.
Roger Federer 
Stefanos Tsitsipas 
