MADRID, SPAIN - MAY 10: Roger Federer of Switzerland returns the ball during his match against Dominic Thiem of Austria during day Seven of the Mutua Madrid Open at La Caja Magica on May 10, 2019 in Madrid, Spain. (Photo by Quality Sport Images/Getty Images)
MADRID, SPAIN - MAY 10: Dominic Thiem of Austria returns a ball in his mens singles quarter-final match against Rodger Federer of Switzerland during day seven of the Mutua Madrid Open at La Caja Magica on May 10, 2019 in Madrid, Spain. (Photo by David Aliaga/MB Media/Getty Images)
MADRID, SPAIN - MAY 10: Rodger Federer of Switzerland returns the ball in his men's singles quarter-final match against Dominic Thiem of Austria during day seven of the Mutua Madrid Open at La Caja Magica on May 10, 2019 in Madrid, Spain. (Photo by Alex Pantling/Getty Images)
MADRID, SPAIN - MAY 10: Dominic Thiem of Austria returns in his mens singles quarter-final match against Rodger Federer of Switzerland during day seven of the Mutua Madrid Open at La Caja Magica on May 10, 2019 in Madrid, Spain. (Photo by Alex Pantling/Getty Images)
