Alexander Bublik returns the ball during the men's singles semi-final match between Radu Albot of Moldova and Alexander Bublik of Kazakhstan at the Singapore Tennis Open tournament in Singapore on Feb. 27, 2021. (Photo by Then Chih Wey/Xinhua)
Alexander Bublik serves the ball during the men's singles semi-final match between Radu Albot of Moldova and Alexander Bublik of Kazakhstan at the Singapore Tennis Open tournament in Singapore on Feb. 27, 2021. (Photo by Then Chih Wey/Xinhua)
Radu Albot returns the ball during the men's singles semi-final match between Radu Albot of Moldova and Alexander Bublik of Kazakhstan at the Singapore Tennis Open tournament in Singapore on Feb. 27, 2021. (Photo by Then Chih Wey/Xinhua)
Alexei Popyrin serves the ball during the men's singles semi-final match between Croatia's Marin Cilic and Australia's Alexei Popyrin at the Singapore Tennis Open tournament in Singapore on Feb. 27, 2021. (Photo by Then Chih Wey/Xinhua)
Marin Cilic serves during the men's singles semi-final match between Croatia's Marin Cilic and Australia's Alexei Popyrin at the Singapore Tennis Open tournament in Singapore on Feb. 27, 2021. (Photo by Then Chih Wey/Xinhua)
Alexei Popyrin hits a return during the men's singles semi-final match between Croatia's Marin Cilic and Australia's Alexei Popyrin at the Singapore Tennis Open tournament in Singapore on Feb. 27, 2021. (Photo by Then Chih Wey/Xinhua)
Marin Cilic hits a return during the men's singles semi-final match between Croatia's Marin Cilic and Australia's Alexei Popyrin at the Singapore Tennis Open tournament in Singapore on Feb. 27, 2021. (Photo by Then Chih Wey/Xinhua)
Alexei Popyrin hits a return during the men's singles semi-final match between Croatia's Marin Cilic and Australia's Alexei Popyrin at the Singapore Tennis Open tournament in Singapore on Feb. 27, 2021. (Photo by Then Chih Wey/Xinhua)
Alexei Popyrin hits a return during the men's singles semi-final match between Croatia's Marin Cilic and Australia's Alexei Popyrin at the Singapore Tennis Open tournament in Singapore on Feb. 27, 2021. (Photo by Then Chih Wey/Xinhua)
Alexei Popyrin reacts during the men's singles semi-final match between Croatia's Marin Cilic and Australia's Alexei Popyrin at the Singapore Tennis Open tournament in Singapore on Feb. 27, 2021. (Photo by Then Chih Wey/Xinhua)