Νέα Υόρκη - 23 Αυγούστου 2017: Δεκαεννέα φορές Grand Slam πρωταθλητή Roger Federer Ελβετία πρακτικές για μας ανοιχτά 2017 στο Billie Jean βασιλιά Εθνικό Κέντρο Αντισφαίρισης στη Νέα Υόρκη - Φωτογραφίες & Εικόνες Αρχείου

NEW YORK - AUGUST 23, 2017: Nineteen times Grand Slam Champion Roger Federer of Switzerland practices for US Open 2017 at Billie Jean King National Tennis Center in New York

NEW YORK - AUGUST 23, 2017: Nineteen times Grand Slam Champion Roger Federer of Switzerland practices for US Open 2017 at Billie Jean King National Tennis Center in New York

NEW YORK - AUGUST 23, 2017: Nineteen times Grand Slam Champion Roger Federer of Switzerland practices for US Open 2017 at Billie Jean King National Tennis Center in New York

NEW YORK - AUGUST 23, 2017: Nineteen times Grand Slam Champion Roger Federer of Switzerland practices for US Open 2017 at Billie Jean King National Tennis Center in New York

NEW YORK - AUGUST 23, 2017: Nineteen times Grand Slam Champion Roger Federer of Switzerland practices for US Open 2017 at Billie Jean King National Tennis Center in New York

NEW YORK - AUGUST 23, 2017: Nineteen times Grand Slam Champion Roger Federer of Switzerland practices for US Open 2017 at Billie Jean King National Tennis Center in New York

NEW YORK - AUGUST 23, 2017: Nineteen times Grand Slam Champion Roger Federer of Switzerland practices for US Open 2017 at Billie Jean King National Tennis Center in New York

NEW YORK - AUGUST 31, 2017: Grand Slam Champion Juan Martin del Potro of Argentina in action during his US Open 2017 second round match at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 1, 2019: 20-time Grand Slam champion Roger Federer of Switzerland in action during the 2019 US Open round of 16 match at National Tennis Center in New York

NEW YORK - SEPTEMBER 1, 2019: 20-time Grand Slam champion Roger Federer of Switzerland in action during the 2019 US Open round of 16 match at National Tennis Center in New York

NEW YORK - SEPTEMBER 3, 2016: Grand Slam champion Rafael Nadal of Spain in practice for US Open 2016 at Billie Jean King National Tennis Center

NEW YORK - AUGUST 31, 2017: Grand Slam champion Roger Federer of Switzerland in action during his US Open 2017 round 2 match at Billie Jean King National Tennis Center

NEW YORK - AUGUST 31, 2017: Grand Slam champion Roger Federer of Switzerland in action during his US Open 2017 round 2 match at Billie Jean King National Tennis Center

NEW YORK - AUGUST 26, 2017: Fifteen times Grand Slam Champion Rafael Nadal of Spain practices for US Open 2017 at Billie Jean King National Tennis Center in New York

NEW YORK - September 6 Seventeen times Grand Slam champion Roger Federer during semifinal match at US Open 2014 against Marin Cilic at Arthur Ashe Stadium on September 6, 2014 in New York

NEW YORK - SEPTEMBER 1, 2019: 20-time Grand Slam champion Roger Federer of Switzerland in action during the 2019 US Open round of 16 match at National Tennis Center in New York

NEW YORK - SEPTEMBER 4, 2017: Grand Slam champion Roger Federer of Switzerland in action during his US Open 2017 round 4 match at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 4, 2017: Grand Slam champion Rafael Nadal of Spain in action during his US Open 2017 round 4 match at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 4, 2017: Professional tennis player Alexandr Dolgopolov of Ukraine in action during his US Open 2017 round 4 match at Billie Jean King National Tennis Center

NEW YORK - AUGUST 31, 2017: Grand Slam champion Roger Federer of Switzerland in action during his US Open 2017 round 2 match at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 3, 2016: Grand Slam champion Rafael Nadal of Spain in practice for US Open 2016 at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 10, 2017: Grand Slam champion Martina Navratilova during Women's Champions Doubles match at US Open 2017 at National Tennis Center in New York

NEW YORK - SEPTEMBER 1, 2018: Professional tennis player Alexander Zverev of Germany in action during his 2018 US Open round of 32 match at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 1, 2018: Professional tennis player Alexander Zverev of Germany in action during his 2018 US Open round of 32 match at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 3, 2016: Grand Slam champion Rafael Nadal of Spain in practice for US Open 2016 at Billie Jean King National Tennis Center

NEW YORK - AUGUST 31, 2017: Grand Slam champion Roger Federer of Switzerland in action during his US Open 2017 round 2 match at Billie Jean King National Tennis Center

NEW YORK - AUGUST 31, 2017: Grand Slam champion Roger Federer of Switzerland in action during his US Open 2017 round 2 match at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 1, 2018: Professional tennis player Alexander Zverev of Germany in action during his 2018 US Open round of 32 match at Billie Jean King National Tennis Center

NEW YORK - AUGUST 31, 2019: 18-time Grand Slam champion Rafael Nadal of Spain in action during his 2019 US Open third round match at Billie Jean King National Tennis Center in New York

NEW YORK - SEPTEMBER 1, 2019: 20-time Grand Slam champion Roger Federer of Switzerland in action during the 2019 US Open round of 16 match at National Tennis Center in New York