Fans watch Spain's Rafael Nadal change his shirt after he defeated Philipp Kohlschreiber of Germany in their match at the China Open tennis tournament in Beijing October 2, 2013. REUTERS/Kim Kyung-Hoon (CHINA - Tags: SPORT TENNIS TPX IMAGES OF THE DAY) 

Tennis - Boodles Tennis Challenge - Stoke Park, Buckinghamshire - 25/6/15
Serbia's Novak Djokovic throws his shirt into the crowd
Action Images via Reuters / Paul Childs
Livepic

Youths fight for the t-shirt of Grigor Dimitrov of Bulgaria after he defeated Lukas Rosol of Czech Republic in their BRD Nastase Tiriac trophy tennis tournament final match in Bucharest April 27, 2014. REUTERS/Bogdan Cristel (ROMANIA - Tags: SPORT TENNIS TPX IMAGES OF THE DAY) 

Fans watch and take photos of Rafael Nadal (R), of Spain as he towels off after defeating compatriot Feliciano Lopez at the Sony Ericsson Open tennis tournament in Key Biscayne, Florida March 28, 2011. REUTERS/Hans Deryk (UNITED STATES - Tags: SPORT TENNIS IMAGES OF THE DAY) 

Fans watch Novak Djokovic of Serbia change his shirt during his men's singles tennis match against Bobby Reynolds of the U.S. at the Wimbledon Tennis Championships, in London June 27, 2013. REUTERS/Suzanne Plunkett (BRITAIN - Tags: SPORT TENNIS)

Spectators watch Rafael Nadal of Spain put on his jacket after removing his shirt following his defeat of Thomaz Bellucci of Brazil in their men's singles tennis match at the Wimbledon tennis championships in London June 26, 2012. REUTERS/Stefan Wermuth (BRITAIN - Tags: SPORT TENNIS)

Thai spectators take pictures of Spain's Rafael Nadal as he changes shirts after his victory against Belgium's Ruben Bemelmans during the Thailand Open 2010 tennis tournament in Bangkok September 30, 2010. REUTERS/Damir Sagolj (THAILAND - Tags: SPORT TENNIS) 

Spectators take photographs of Rafael Nadal of Spain as he changes his shirt during his men's singles tennis match against Lukas Rosol of the Czech Republic at the Wimbledon Tennis Championships, in London June 26, 2014. REUTERS/Max Rossi (BRITAIN - Tags: SPORT TENNIS)

Fans reach for the shirt of Rafael Nadal (R) of Spain after he threw it into the crowd during his exhibition singles tennis match against David Nalbandian of Argentina in Buenos Aires November 23, 2013. Nadal took part in the match as part of Nalbandian's farewell event as the latter retires from professional tennis. REUTERS/Marcos Brindicci (ARGENTINA - Tags: SPORT TENNIS)