![Roger Federer of Switzerland hits a smash to Carlos Berlocq of Argentina at the U.S. Open tennis championships in New York August 29, 2013. REUTERS/Ray Stubblebine (UNITED STATES - Tags: SPORT TENNIS Roger Federer of Switzerland hits a smash to Carlos Berlocq of Argentina at the U.S. Open tennis championships in New York August 29, 2013. REUTERS/Ray Stubblebine (UNITED STATES - Tags: SPORT TENNIS](https://c8.alamy.com/comp/2CX9B0P/roger-federer-of-switzerland-hits-a-smash-to-carlos-berlocq-of-argentina-at-the-us-open-tennis-championships-in-new-york-august-29-2013-reutersray-stubblebine-united-states-tags-sport-tennis-2CX9B0P.jpg)
Roger Federer of Switzerland hits a smash to Carlos Berlocq of Argentina at the U.S. Open tennis championships in New York August 29, 2013. REUTERS/Ray Stubblebine (UNITED STATES - Tags: SPORT TENNIS
![Roger Federer of Switzerland hits a smash against Juan Martin Del Potro of Argentina during their men's singles quarter-finals match at the Australian Open tennis tournament in Melbourne January 24, 2012. REUTERS/Darren Roger Federer of Switzerland hits a smash against Juan Martin Del Potro of Argentina during their men's singles quarter-finals match at the Australian Open tennis tournament in Melbourne January 24, 2012. REUTERS/Darren](https://c8.alamy.com/comp/2CWFRK5/roger-federer-of-switzerland-hits-a-smash-against-juan-martin-del-potro-of-argentina-during-their-mens-singles-quarter-finals-match-at-the-australian-open-tennis-tournament-in-melbourne-january-24-2012-reutersdarren-whiteside-australia-tags-sport-tennis-2CWFRK5.jpg)
Roger Federer of Switzerland hits a smash against Juan Martin Del Potro of Argentina during their men's singles quarter-finals match at the Australian Open tennis tournament in Melbourne January 24, 2012. REUTERS/Darren
![31.03.2021, Biel, Swiss Tennis Arena, ITF WORLD TENNIS TOUR M25 BIEL: Leandro Riedi (Schweiz) vs Dominic Stricker (Schweiz), (Switzerland/Croatia OUT Stock Photo - Alamy 31.03.2021, Biel, Swiss Tennis Arena, ITF WORLD TENNIS TOUR M25 BIEL: Leandro Riedi (Schweiz) vs Dominic Stricker (Schweiz), (Switzerland/Croatia OUT Stock Photo - Alamy](https://c8.alamy.com/zooms/6/f834040299294c4abc8c8e5aabd46eec/2f6fwtk.jpg)
31.03.2021, Biel, Swiss Tennis Arena, ITF WORLD TENNIS TOUR M25 BIEL: Leandro Riedi (Schweiz) vs Dominic Stricker (Schweiz), (Switzerland/Croatia OUT Stock Photo - Alamy
![Novak Djokovic of Serbia tries to smash a shot to Roger Federer of Switzerland during their semi-final match at the Australian Open tennis tournament in Melbourne January 27, 2011. REUTERS/David Gray (AUSTRALIA - Novak Djokovic of Serbia tries to smash a shot to Roger Federer of Switzerland during their semi-final match at the Australian Open tennis tournament in Melbourne January 27, 2011. REUTERS/David Gray (AUSTRALIA -](https://c8.alamy.com/comp/2CYNK5K/novak-djokovic-of-serbia-tries-to-smash-a-shot-to-roger-federer-of-switzerland-during-their-semi-final-match-at-the-australian-open-tennis-tournament-in-melbourne-january-27-2011-reutersdavid-gray-australia-tags-sport-tennis-2CYNK5K.jpg)