David Goffin of Belgium in action against Novak Djokovic of Serbia during a semifinal round match at the Miami Open tennis tournament on Key Biscayne, Miami, Florida, USA, 01 April 2016. Djokovic defeated Goffin. EPA/ERIK S. LESSER

Kei Nishikori of Japan in action against Nick Kyrgios of Australia during their semifinal match at the Miami Open tennis tournament on Key Biscayne, Miami, Florida, USA, 01 April 2016. EPA/RHONA WISE

Victoria Azarenka of Belarus reacts while playing against Angelique Kerber of Germany during their semifinal round match at the Miami Open tennis tournament on Key Biscayne, Miami, Florida, USA, 31 March 2016. Azarenka will play Svetlana Kuznetsova of Russia in the women’s singles final. EPA/ERIK S. LESSER

A woman shades herself from the hot Sun as Svetlana Kuznetsova of Russia plays Timea Bacsinszky of Switzerland during their semi final match at the Miami Open tennis tournament on Key Biscayne, Miami, Florida, USA, 31 March 2016. EPA/ERIK S. LESSER

Nick Kyrgios of Australia reacts after losing a point against Kei Nishikori of Japan during their semifinal match at the Miami Open tennis tournament on Key Biscayne, Miami, Florida, USA, 01 April 2016. EPA/RHONA WISE