2021 Antalya Open

The 2017 Antalya Open was a men's tennis tournament played on grass courts. It was the 1st edition of the Antalya Open, and part of the ATP World Tour 250 series of the 2017 ATP World Tour. It took place at the Kaya Palazzo Resort in Belek, Antalya Province, Turkey, from June 25–July 1.

The 2018 Amex-Istanbul Challenger was a professional tennis tournament played on hard courts. It was the 31st edition of the tournament which was part of the 2018 ATP Challenger Tour. It took place in Istanbul, Turkey between 10 and 16 September 2018.

The 2019 Lyon Open was a men's tennis tournament played on outdoor clay courts. It was the third edition of the Lyon Open and part of the ATP Tour 250 series of the 2019 ATP Tour. It took place in the city of Lyon, France, from 19 May through 25 May 2019. Unseeded Benoît Paire won the singles title.

The 2019 Antalya Open was a men's tennis tournament played on grass courts. It was the 3rd edition of the event, and part of the ATP Tour 250 series of the 2019 ATP Tour. It took place at the Kaya Palazzo Resort in Belek, Antalya Province, Turkey, from June 23–29.

The 2019 Winston–Salem Open was a men's tennis tournament played on outdoor hard courts. It was the 51st edition of the Winston-Salem Open, and part of the ATP Tour 250 Series of the 2019 ATP Tour. It took place at Wake Forest University in Winston-Salem, North Carolina, United States, from August 18 through August 24, 2019. It was the last event on the 2019 US Open Series before the 2019 US Open.

The 2019 European Open was a men's tennis tournament played on indoor hard courts. It was the fourth edition of the European Open and part of the ATP Tour 250 series of the 2019 ATP Tour. It took place at the Lotto Arena in Antwerp, Belgium, from October 14 to October 20.

The 2021 Barcelona Open Banc Sabadell was a men's tennis tournament played on outdoor clay courts. It was the 68th edition of the event and part of the ATP Tour 500 series of the 2021 ATP Tour. It took place at the Real Club de Tenis Barcelona in Barcelona, Spain, from 19 to 25 April 2021.

The 2020 Amex-Istanbul Challenger was a professional tennis tournament played on hard courts. It was the 33rd edition of the tournament which was part of the 2020 ATP Challenger Tour. It took place in Istanbul, Turkey between 19 and 25 October 2020.

The 2020 Sparkassen ATP Challenger was a professional tennis tournament played on indoor hard courts in Ortisei, Italy between 16 and 22 November 2020. It was the eleventh edition of the tournament and was part of the 2020 ATP Challenger Tour.

The 2021 Great Ocean Road Open was a tournament on the 2021 ATP Tour, one of six events in the 2021 Melbourne Summer Series. It was played on outdoor hard courts in Melbourne, Australia. It was organised as a lead-up tournament to the 2021 Australian Open, and was held at the same venue, due to other tournaments in Australia being cancelled as a result of the COVID-19 pandemic. This tournament took place simultaneously with the 2021 Murray River Open and the 2021 ATP Cup, and was considered a relocation of the men's 2021 Adelaide International.

The 2021 Amex-Istanbul Challenger was a professional tennis tournament played on hard courts. It was the 34th edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Istanbul, Turkey between 18 and 24 January 2021.

The 2021 Singapore Tennis Open is a tournament on the 2021 ATP Tour. It is played on indoor hard courts in Singapore. It is organised with a single-year licence in 2021, and was held at OCBC Arena in Singapore from February 22 to February 28, 2021.

The 2021 MercedesCup was a men's tennis tournament played on outdoor grass courts. It was the 43rd edition of the Stuttgart Open, and part of the ATP Tour 250 series of the 2021 ATP Tour. It was held at the Tennis Club Weissenhof in Stuttgart, Germany, from 8 June until 13 June 2021. Unseeded Marin Čilić won the singles title.

The 2021 Eastbourne International was a combined men's and women's tennis tournament played on outdoor grass courts. It was the 46th edition of the event for the women and the 10th edition for the men. The tournament was classified as a WTA 500 tournament on the 2021 WTA Tour and as an ATP Tour 250 series on the 2021 ATP Tour. The tournament took place at the Devonshire Park Lawn Tennis Club in Eastbourne, United Kingdom between 21 and 26 June 2021.

The 2021 Sparkassen Open was a professional tennis tournament played on clay courts. It was the 27th edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Braunschweig, Germany between 5 and 11 July 2021.

The 2021 Moselle Open was a tennis tournament played on indoor hard courts. It was the 23rd edition of the Moselle Open, and part of the ATP World Tour 250 Series of the 2021 ATP Tour. It took place at the Arènes de Metz from September 20 through September 26, 2021.

The 2021 European Open was a men's tennis tournament played on indoor hard courts. It was the sixth edition of the European Open and part of the ATP Tour 250 series of the 2021 ATP Tour. It took place at the Lotto Arena in Antwerp, Belgium, from 18 October until 24 October 2021.

The 2021 Open International de Tennis de Roanne was a professional tennis tournament played on indoor hard courts. It was the first edition of the tournament which was part of the 2021 ATP Challenger Tour. It took place in Roanne, France between 8 and 14 November 2021.

The 2022 Melbourne Summer Set1 was one of two tournaments of the Melbourne Summer Set. The Melbourne Summer Set 1 featured an ATP Tour 250 tournament and a WTA 250 tournament, both played on hardcourts.

The 2022 Maharashtra Open was a 2022 ATP Tour tennis tournament happening on outdoor hard courts. It was the 26th edition of the only ATP tournament played in India and took place in Pune, India, from 31 January through 6 February 2022. It was a ATP 250 championship and South Asia's only ATP Tour event.