Fabio Fognini, of Italy, hits a return to Rafael Nadal during a men's semifinal match at the Miami Open tennis tournament, Friday, March 31, 2017, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)
Rafael Nadal, of Spain, hits a return to Fabio Fognini, of Italy, during a men's semifinal match at the Miami Open tennis tournament, Friday, March 31, 2017, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)
Rafael Nadal, of Spain, hits a return to Fabio Fognini, of Italy, during a men's semifinal match at the Miami Open tennis tournament, Friday, March 31, 2017, in Key Biscayne, Fla. (AP Photo/Lynne Sladky)
Fabio Fognini, of Italy, returns the ball to Kei Nishikori, of Japan, during the Miami Open tennis tournament, Wednesday, March 29, 2017, in Key Biscayne, Fla. (AP Photo/Luis M. Alvarez)
Italy's Fabio Fognini twirls his shirt around as he celebrates with teammates his victory in the Davis Cup first round tennis match against Argentina's Guido Pella with his team in Buenos Aires, Argentina, Monday, Feb. 6, 2017.(AP Photo/Natacha Pisarenko)
Former soccer star Diego Maradona cheers as he attends the Davis Cup first round tennis match between Italy's Fabio Fognini and Argentina's Guido Pellain Buenos Aires, Argentina, Monday, Feb. 6, 2017.(AP Photo/Natacha Pisarenko)
Argentina's Guido Pella returns the ball to Italy's Fabio Fognini during the Davis Cup first round tennis match in Buenos Aires, Argentina, Monday, Feb. 6, 2017.(AP Photo/Natacha Pisarenko)
Italy's Fabio Fognini returns the ball to Argentina's Guido Pella during the Davis Cup first round tennis match in Buenos Aires, Argentina, Monday, Feb. 6, 2017.(AP Photo/Natacha Pisarenko)
France's Gael Monfils, right, and Italy's Fabio Fognini shake hands after their third round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Saturday, May 31, 2014. (AP Photo/David Vincent)
Italy's Fabio Fognini sits after falling as he plays France's Gael Monfils in their third round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Saturday, May 31, 2014. (AP Photo/David Vincent)
France's Gael Monfils returns the ball to Italy's Fabio Fognini during their third round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Saturday, May 31, 2014. (AP Photo/David Vincent)
France's Gael Monfils shouts after defeating Italy's Fabio Fognini in their third round match of the French Open tennis tournament at the Roland Garros stadium, in Paris, France, Saturday, May 31, 2014. (AP Photo/David Vincent)