Milos Raonic of Canada in action against Nick Kyrgios of Australia during their quarterfinal match at the Miami Open tennis tournament on Key Biscayne, Miami, Florida, USA, 31 March 2016 EPA/RHONA WISE

Novak Djokovic of Serbia in action against David Goffin of Belgium during a semifinal round match at the Miami Open tennis tournament on Key Biscayne, Miami, Florida, USA, 01 April 2016. Djokovic defeated Goffin and will face either Kei Nishikori of Japan or Nick Kyrgios of Australia in the men’s singles final. EPA/ERIK S. LESSER

Gael Monfils of France reacts during a quarterfinal round match against Kei Nishikori of Japan at the Miami Open tennis tournament on Key Biscayne, Miami, Florida, USA, 31 March 2016. Nishikori defeated Monfils. EPA/ERIK S. LESSER

Kei Nishikori of Japan in action against Gael Monfils of France during their quarterfinal match at the Miami Open tennis tournament on Key Biscayne, Miami, Florida, USA, 31 March 2016. EPA/RHONA WISE

Nick Kyrgios of Australia in action against Milos Raonic of Canada during their quarterfinal match at the Miami Open tennis tournament on Key Biscayne, Miami, Florida, USA, 31 March 2016. EPA/RHONA WISE

David Goffin of Belgium walks off the court after losing to Novak Djokovic of Serbia during a semifinal round match at the Miami Open tennis tournament on Key Biscayne, Miami, Florida, USA, 01 April 2016. EPA/ERIK S. LESSER