Alexander Zverev was the defending champion and successfully defended his title, defeating Alex de Minaur in the final, 6–2, 6–4.
Kevin Anderson was the defending champion, but withdrew before the tournament began because of a right elbow injury.
Juan Martín del Potro was the defending champion, but withdrew due to injury after accepting a wildcard before the tournament began.
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.
João Sousa was the defending champion, but lost in the second round to David Goffin.
Nikoloz Basilashvili was the defending champion and successfully defended his title, defeating Andrey Rublev in the final, 7–5, 4–6, 6–3. En route to doing so, Basilashvili saved two match points against Alexander Zverev in the semifinals.
Alexander Zverev was the two-time defending champion but chose not to defend his title.
Novak Djokovic was the defending champion, but lost to Stefanos Tsitsipas in the quarterfinals.
Stefanos Tsitsipas was the defending champion, but chose not to defend his title.
Daniil Medvedev defeated Alexander Zverev in the final, 5–7, 6–4, 6–1, to win the singles title at the 2020 Paris Masters.
Stefanos Tsitsipas defeated Andrey Rublev in the final, 6–3, 6–3 to win the singles title at the 2021 Monte-Carlo Masters. It was his first ATP Tour Masters 1000 title, and he became the first Greek man to win a Masters 1000 event.
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 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 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.
Hubert Hurkacz was the reigning champion from when the tournament was last held in 2019, but chose not to participate this year.
This was the first edition of the tournament, which was primarily organized to compensate for the cancellation of Asian tournaments in 2021 due to the COVID-19 pandemic.
The 2021 Erste Bank Open was a men's tennis tournament played on indoor hard courts. It was the 47th edition of the event, and part of the ATP Tour 500 Series of the 2021 ATP Tour. It was held at the Wiener Stadthalle in Vienna, Austria, from 25 until 31 October 2021.
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 Félix Auger-Aliassime in the final, 7–5, 7–6(7–4) to win the singles title at the 2022 Open 13.
Alexander Zverev 
Frances Tiafoe 
