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Ivo Kaderka, Vaclav Klaus, Prague Open 2020

President of Czech Tennis Association Ivo Kaderka, left, and former Czech president Vaclav Klaus are seen during the I. CLTK Prague Open of the ATP Challenger Tour match Stan Wawrinka of Switzerland vs Roman Saifullin of Russia in Prague, Czech Republic, August 17, 2020. (CTK Photo/Michal Kamaryt)

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Stan Wawrinka, Prague Open 2020

Stan Wawrinka of Switzerland returns a shot to Roman Saifullin of Russia during the I. CLTK Prague Open of the ATP Challenger Tour match in Prague, Czech Republic, August 17, 2020. (CTK Photo/Michal Kamaryt)

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Roman Saifullin, Prague Open 2020

Roman Saifullin of Russia reacts during his I. CLTK Prague Open of the ATP Challenger Tour match against Stan Wawrinka of Switzerland in Prague, Czech Republic, August 17, 2020. (CTK Photo/Michal Kamaryt)

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Stan Wawrinka, Prague Open 2020

Stan Wawrinka of Switzerland serves the ball to Roman Saifullin of Russia during the I. CLTK Prague Open of the ATP Challenger Tour match in Prague, Czech Republic, August 17, 2020. (CTK Photo/Michal Kamaryt)

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Stan Wawrinka, Prague Open 2020

Stan Wawrinka of Switzerland holds tennis balls during his I. CLTK Prague Open of the ATP Challenger Tour match against Roman Saifullin of Russia in Prague, Czech Republic, August 17, 2020. (CTK Photo/Michal Kamaryt)

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Roman Saifullin, Prague Open 2020

Roman Saifullin of Russia 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 17, 2020. (CTK Photo/Michal Kamaryt)

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Stan Wawrinka, Prague Open 2020

Stan Wawrinka of Switzerland holds tennis balls during his I. CLTK Prague Open of the ATP Challenger Tour match against Roman Saifullin of Russia in Prague, Czech Republic, August 17, 2020. (CTK Photo/Michal Kamaryt)

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Roman Saifullin, Prague Open 2020

Roman Saifullin of Russia 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 17, 2020. (CTK Photo/Michal Kamaryt)

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Stan Wawrinka, Prague Open 2020

Stan Wawrinka of Switzerland holds tennis balls during his I. CLTK Prague Open of the ATP Challenger Tour match against Roman Saifullin of Russia in Prague, Czech Republic, August 17, 2020. (CTK Photo/Michal Kamaryt)

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Stan Wawrinka, Prague Open 2020

Stan Wawrinka of Switzerland serves the ball to Roman Saifullin of Russia during the I. CLTK Prague Open of the ATP Challenger Tour match in Prague, Czech Republic, August 17, 2020. (CTK Photo/Michal Kamaryt)

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Stan Wawrinka, Prague Open 2020

Stan Wawrinka of Switzerland returns a shot to Roman Saifullin of Russia during the I. CLTK Prague Open of the ATP Challenger Tour match in Prague, Czech Republic, August 17, 2020. (CTK Photo/Michal Kamaryt)

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LUKAS ROSOL

Czech tennis player Lukas Rosol (pictured) in action during the match I. CLTK Prague Open By Moneta Prague against Roman Safiullin of Russia in Prague, Czech Republic, August 16, 2020. (CTK Photo/Michal Kamaryt)

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ROMAN SAFIULLIN

Tennis player Roman Safiullin of Russia (pictured) in action during the match I. CLTK Prague Open By Moneta Prague against Czech Tomas Rosol in Prague, Czech Republic, August 16, 2020. (CTK Photo/Michal Kamaryt)

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ROMAN SAFIULLIN

Tennis player Roman Safiullin of Russia (pictured) in action during the match I. CLTK Prague Open By Moneta Prague against Czech Tomas Rosol in Prague, Czech Republic, August 16, 2020. (CTK Photo/Michal Kamaryt)

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LUKAS ROSOL

Czech tennis player Lukas Rosol (pictured) in action during the match I. CLTK Prague Open By Moneta Prague against Roman Safiullin of Russia in Prague, Czech Republic, August 16, 2020. (CTK Photo/Michal Kamaryt)

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LUKAS ROSOL

Czech tennis player Lukas Rosol (pictured) in action during the match I. CLTK Prague Open By Moneta Prague against Roman Safiullin of Russia in Prague, Czech Republic, August 16, 2020. (CTK Photo/Michal Kamaryt)

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ROMAN SAFIULLIN

Tennis player Roman Safiullin of Russia (pictured) in action during the match I. CLTK Prague Open By Moneta Prague against Czech Tomas Rosol in Prague, Czech Republic, August 16, 2020. (CTK Photo/Michal Kamaryt)

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ROMAN SAFIULLIN

Tennis player Roman Safiullin of Russia (pictured) in action during the match I. CLTK Prague Open By Moneta Prague against Czech Tomas Rosol in Prague, Czech Republic, August 16, 2020. (CTK Photo/Michal Kamaryt)

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LUKAS ROSOL

Czech tennis player Lukas Rosol (pictured) in action during the match I. CLTK Prague Open By Moneta Prague against Roman Safiullin of Russia in Prague, Czech Republic, August 16, 2020. (CTK Photo/Michal Kamaryt)

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ROMAN SAFIULLIN

Tennis player Roman Safiullin of Russia (pictured) in action during the match I. CLTK Prague Open By Moneta Prague against Czech Tomas Rosol in Prague, Czech Republic, August 16, 2020. (CTK Photo/Michal Kamaryt)

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LUKAS ROSOL

Czech tennis player Lukas Rosol (pictured) in action during the match I. CLTK Prague Open By Moneta Prague against Roman Safiullin of Russia in Prague, Czech Republic, August 16, 2020. (CTK Photo/Michal Kamaryt)

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LUKAS ROSOL

Czech tennis player Lukas Rosol (pictured) in action during the match I. CLTK Prague Open By Moneta Prague against Roman Safiullin of Russia in Prague, Czech Republic, August 16, 2020. (CTK Photo/Michal Kamaryt)

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LUKAS ROSOL

Czech tennis player Lukas Rosol (pictured) in action during the match I. CLTK Prague Open By Moneta Prague against Roman Safiullin of Russia in Prague, Czech Republic, August 16, 2020. (CTK Photo/Michal Kamaryt)

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LUKAS ROSOL

Czech tennis player Lukas Rosol (pictured) in action during the match I. CLTK Prague Open By Moneta Prague against Roman Safiullin of Russia in Prague, Czech Republic, August 16, 2020. (CTK Photo/Michal Kamaryt)

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Stanislas Stan Wawrinka

Swiss tennis player Stanislas Stan Wawrinka in action during the I. CLTK Prague Open of the ATP Challenger Tour match against Russian Aslan Karatsev on August 22, 2020, in Prague, Czech Republic. (CTK Photo/Roman Vondrous)

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Stanislas Stan Wawrinka

Swiss tennis player Stanislas Stan Wawrinka in action during the I. CLTK Prague Open of the ATP Challenger Tour match against Russian Aslan Karatsev on August 22, 2020, in Prague, Czech Republic. (CTK Photo/Roman Vondrous)

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Stanislas Stan Wawrinka

Swiss tennis player Stanislas Stan Wawrinka in action during the I. CLTK Prague Open of the ATP Challenger Tour match against Russian Aslan Karatsev on August 22, 2020, in Prague, Czech Republic. (CTK Photo/Roman Vondrous)

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Aslan Karatsev, Stanislas Stan Wawrinka

Swiss tennis player Stanislas Stan Wawrinka, right, with the trophy for winner of the I. CLTK Prague Open of the ATP Challenger Tour and Russian tennis player Aslan Karatsev, second place, on August 22, 2020, in Prague, Czech Republic. (CTK Photo/Roman Vondrous)

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Stanislas Stan Wawrinka

Swiss tennis player Stanislas Stan Wawrinka comes to the I. CLTK Prague Open of the ATP Challenger Tour match against Russian Aslan Karatsev on August 22, 2020, in Prague, Czech Republic. (CTK Photo/Roman Vondrous)

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Vaclav Klaus, Stanislas Stan Wawrinka

Former Czech President Vaclav Klaus, left, watches Swiss tennis player Stanislas Stan Wawrinka ,right, in action during the I. CLTK Prague Open of the ATP Challenger Tour match against Russian Aslan Karatsev on August 22, 2020, in Prague, Czech Republic. (CTK Photo/Roman Vondrous)

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Aslan Karatsev

Russian tennis player Aslan Karatsev in action during the I. CLTK Prague Open of the ATP Challenger Tour match against Swiss Stanislas Stan Wawrinka on August 22, 2020, in Prague, Czech Republic. (CTK Photo/Roman Vondrous)

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Aslan Karatsev

Russian tennis player Aslan Karatsev in action during the I. CLTK Prague Open of the ATP Challenger Tour match against Swiss Stanislas Stan Wawrinka on August 22, 2020, in Prague, Czech Republic. (CTK Photo/Roman Vondrous)

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Stanislas Stan Wawrinka

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. (CTK Photo/Roman Vondrous)

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Aslan Karatsev

Russian tennis player Aslan Karatsev in action during the I. CLTK Prague Open of the ATP Challenger Tour match against Swiss Stanislas Stan Wawrinka on August 22, 2020, in Prague, Czech Republic. (CTK Photo/Roman Vondrous)

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Stanislas Stan Wawrinka

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. (CTK Photo/Roman Vondrous)

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Stanislas Stan Wawrinka

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. (CTK Photo/Roman Vondrous)

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Stanislas Stan Wawrinka

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. (CTK Photo/Roman Vondrous)

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Stanislas Stan Wawrinka

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. (CTK Photo/Roman Vondrous)

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Stanislas Stan Wawrinka

Swiss tennis player Stanislas Stan Wawrinka in action during the I. CLTK Prague Open of the ATP Challenger Tour match against Russian Aslan Karatsev on August 22, 2020, in Prague, Czech Republic. (CTK Photo/Roman Vondrous)

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Aslan Karatsev

Russian tennis player Aslan Karatsev in action during the I. CLTK Prague Open of the ATP Challenger Tour match against Swiss Stanislas Stan Wawrinka on August 22, 2020, in Prague, Czech Republic. (CTK Photo/Roman Vondrous)

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Sumit Nagal, Prague Open 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. (CTK Photo/Michal Kamaryt)

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Michael Vrbensky, Prague Open 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. (CTK Photo/Michal Kamaryt)

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Michael Vrbensky, Prague Open 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. (CTK Photo/Michal Kamaryt)

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Elias Ymer, Prague Open 2020

Elias Ymer of Sweden returns a shot to Michael Vrbensky of Czech Republic during the I. CLTK Prague Open of the ATP Challenger Tour match in Prague, Czech Republic, August 20, 2020. (CTK Photo/Michal Kamaryt)

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Elias Ymer, Prague Open 2020

Elias Ymer of Sweden returns a shot to Michael Vrbensky of Czech Republic during the I. CLTK Prague Open of the ATP Challenger Tour match in Prague, Czech Republic, August 20, 2020. (CTK Photo/Michal Kamaryt)

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Michael Vrbensky, Prague Open 2020

Michael Vrbensky of Czech Republic reacts during the I. CLTK Prague Open of the ATP Challenger Tour match against Elias Ymer of Sweden in Prague, Czech Republic, August 20, 2020. (CTK Photo/Michal Kamaryt)

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Sumit Nagal, Prague Open 2020

Sumit Nagal of India reacts during the I. CLTK Prague Open of the ATP Challenger Tour match against Stan Wawrinka of Switzerland in Prague, Czech Republic, August 20, 2020. (CTK Photo/Michal Kamaryt)

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Michael Vrbensky, Prague Open 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. (CTK Photo/Michal Kamaryt)

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Elias Ymer, Prague Open 2020

Elias Ymer of Sweden serves the ball to Michael Vrbensky of Czech Republic during the I. CLTK Prague Open of the ATP Challenger Tour match in Prague, Czech Republic, August 20, 2020. (CTK Photo/Michal Kamaryt)

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Michael Vrbensky, Prague Open 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. (CTK Photo/Michal Kamaryt)