Philipp Kohlschreiber, of Germany, returns the ball to Rafael Nadal, of Spain, during the Miami Open tennis tournament, Sunday, March 26, 2017, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)
Rafael Nadal, of Spain, returns the ball to Philipp Kohlschreiber, of Germany, during the Miami Open tennis tournament, Sunday, March 26, 2017, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)
Rafael Nadal, of Spain, returns the ball to Dudi Sela, of Israel, during the Miami Open tennis tournament, Friday, March 24, 2017, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)
Rafael Nadal, of Spain, gestures after defeating Dudi Sela, of Israel, during the Miami Open tennis tournament, Friday, March 24, 2017, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)
Spain's Isco, right, celebrates his goal with teammate David Silva after scoring during a 2018 World Cup Group G qualifying soccer match between Spain and Israel, at El Molinon Stadium, in Gijon, northern Spain, Friday, March 24, 2017. Spain won the match 4-1. (AP Photo/Alvaro Barrientos)
Garbine Muguruza, of Spain, hits a return to Christina McHale during the Miami Open tennis tournament, Friday, March 24, 2017, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)
Marcel Granollers, of Spain, returns a shot from Borna Coric, of Croatia, during a tennis match at the Miami Open, Thursday, March 23, 2017 in Key Biscayne, Fla. (AP Photo/Wilfredo Lee)
A family shields themselves from the sun as they watch a tennis match between Marcel Granollers, of Spain, and Borna Coric, of Croatia, at the Miami Open, Thursday, March 23, 2017 in Key Biscayne, Fla. (AP Photo/Wilfredo Lee)
Pablo Carreno Busta, of Spain, hits to Stanislas Wawrinka, of Switzerland, during a semifinal match at the BNP Paribas Open tennis tournament, Saturday, March 18, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Stanislas Wawrinka, of Switzerland, celebrates a point against Pablo Carreno Busta, of Spain, during a semifinal match at the BNP Paribas Open tennis tournament, Saturday, March 18, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Pablo Carreno Busta, of Spain, hits to Stanislas Wawrinka, of Switzerland, during a semifinal match at the BNP Paribas Open tennis tournament, Saturday, March 18, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Stanislas Wawrinka, of Switzerland, hits to Pablo Carreno Busta, of Spain, during a semifinal match at the BNP Paribas Open tennis tournament, Saturday, March 18, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
A fan holds up a sign for Pablo Carreno Busta, of Spain, during his match against Pablo Cuevas, of Uruguay, at the BNP Paribas Open tennis tournament, Thursday, March 16, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Pablo Carreno Busta, of Spain, returns a shot to Pablo Cuevas, of Uruguay, at the BNP Paribas Open tennis tournament, Thursday, March 16, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Pablo Cuevas, of Uruguay, dives to return a shot against Pablo Carreno Busta, of Spain, at the BNP Paribas Open tennis tournament, Thursday, March 16, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Roger Federer, of Switzerland, celebrates after beating Rafael Nadal, of Spain, at the BNP Paribas Open tennis tournament, Wednesday, March 15, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Roger Federer, of Switzerland, returns a shot against Rafael Nadal, of Spain, at the BNP Paribas Open tennis tournament, Wednesday, March 15, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Rafael Nadal, of Spain, serves to Roger Federer, of Switzerland, at the BNP Paribas Open tennis tournament, Wednesday, March 15, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Roger Federer, of Switzerland, returns a shot to Rafael Nadal, of Spain, at the BNP Paribas Open tennis tournament, Wednesday, March 15, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)
Fernando Verdasco, of Spain, returns a shot to Rafael Nadal, of Spain, at the BNP Paribas Open tennis tournament, Tuesday, March 14, 2017, in Indian Wells, Calif. (AP Photo/Mark J. Terrill)