![Oleg S. Twitterissä: "Updated ATP Challenger Tour calendar now has 12 tournaments in November/early December, including 3 Challengers in South America and 2 in USA. https://t.co/dXu0eP7kyS" / Twitter Oleg S. Twitterissä: "Updated ATP Challenger Tour calendar now has 12 tournaments in November/early December, including 3 Challengers in South America and 2 in USA. https://t.co/dXu0eP7kyS" / Twitter](https://pbs.twimg.com/media/EkJdNawXsAEXdtd.png)
Oleg S. Twitterissä: "Updated ATP Challenger Tour calendar now has 12 tournaments in November/early December, including 3 Challengers in South America and 2 in USA. https://t.co/dXu0eP7kyS" / Twitter
![Prague, Czech Republic. 22nd Aug, 2020. Swiss tennis player Stanislas "Stan" Wawrinka with the trophy for winner of the I. CLTK Prague Open of the ATP Challenger Tour, on August 22, 2020, Prague, Czech Republic. 22nd Aug, 2020. Swiss tennis player Stanislas "Stan" Wawrinka with the trophy for winner of the I. CLTK Prague Open of the ATP Challenger Tour, on August 22, 2020,](https://c8.alamy.com/comp/2CCPCGB/prague-czech-republic-22nd-aug-2020-swiss-tennis-player-stanislas-stan-wawrinka-with-the-trophy-for-winner-of-the-i-cltk-prague-open-of-the-atp-challenger-tour-on-august-22-2020-in-prague-czech-republic-credit-roman-vondrousctk-photoalamy-live-news-2CCPCGB.jpg)
Prague, Czech Republic. 22nd Aug, 2020. Swiss tennis player Stanislas "Stan" Wawrinka with the trophy for winner of the I. CLTK Prague Open of the ATP Challenger Tour, on August 22, 2020,
![Prague, Czech Republic. 20th Aug, 2020. Sumit Nagal of India returns a shot to Stan Wawrinka of Switzerland during the I. CLTK Prague Open of the ATP Challenger Tour match in Prague, Prague, Czech Republic. 20th Aug, 2020. Sumit Nagal of India returns a shot to Stan Wawrinka of Switzerland during the I. CLTK Prague Open of the ATP Challenger Tour match in Prague,](https://c8.alamy.com/comp/2CCAJGC/prague-czech-republic-20th-aug-2020-sumit-nagal-of-india-returns-a-shot-to-stan-wawrinka-of-switzerland-during-the-i-cltk-prague-open-of-the-atp-challenger-tour-match-in-prague-czech-republic-august-20-2020-credit-michal-kamarytctk-photoalamy-live-news-2CCAJGC.jpg)
Prague, Czech Republic. 20th Aug, 2020. Sumit Nagal of India returns a shot to Stan Wawrinka of Switzerland during the I. CLTK Prague Open of the ATP Challenger Tour match in Prague,
![Michael Vrbensky of Czech Republic returns a shot to Elias Ymer of Sweden during the I. CLTK Prague Open of the ATP Challenger Tour match in Prague, Czech Republic, August 20, 2020. ( Michael Vrbensky of Czech Republic returns a shot to Elias Ymer of Sweden during the I. CLTK Prague Open of the ATP Challenger Tour match in Prague, Czech Republic, August 20, 2020. (](https://c8.alamy.com/comp/2CCAKM0/michael-vrbensky-of-czech-republic-returns-a-shot-to-elias-ymer-of-sweden-during-the-i-cltk-prague-open-of-the-atp-challenger-tour-match-in-prague-czech-republic-august-20-2020-ctk-photomichal-kamaryt-2CCAKM0.jpg)
Michael Vrbensky of Czech Republic returns a shot to Elias Ymer of Sweden during the I. CLTK Prague Open of the ATP Challenger Tour match in Prague, Czech Republic, August 20, 2020. (
![Tennis Ohio Championships - 2021 Columbus WTA 125/ATP Challenger - 2016 Columbus Challenger- 2022 INFO Tennis Ohio Championships - 2021 Columbus WTA 125/ATP Challenger - 2016 Columbus Challenger- 2022 INFO](https://images.squarespace-cdn.com/content/v1/57c4851c8419c295dde4923a/1556638524970-I1BFGKI5TDN0NCYRRQFM/ATP_ChallengerTour_Primary.jpg?format=1000w)