Search｜Photos & Images & Videos｜KYODO NEWS IMAGES INC

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)

E

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)

E

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)

E

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)

E

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)

E

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)

E

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)

E

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)

E

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)

E

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)

E

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)