Νέα Υόρκη - 22 Αυγούστου 2018: 13-χρόνος Grand Slam πρωταθλητής Νόβακ Τζιόκοβιτς, Σερβία πρακτικές για το 2018 Us Open στο Billie Jean βασιλιά εθνικό τένις - Φωτογραφίες & Εικόνες Αρχείου

NEW YORK - AUGUST 22, 2018: 13-time Grand Slam champion Novak Djokovic of Serbia practices for the 2018 US Open at Billie Jean King National Tennis

NEW YORK - AUGUST 22, 2018: 13-time Grand Slam champion Novak Djokovic of Serbia practices for the 2018 US Open at Billie Jean King National Tennis

NEW YORK - AUGUST 22, 2018: 13-time Grand Slam champion Novak Djokovic of Serbia practices for the 2018 US Open at Billie Jean King National Tennis

NEW YORK - SEPTEMBER 3, 2018: Grand Slam Champion Marin Cilic of Croatia in action during his 2018 US Open round of 16 match at Billie Jean King National Tennis Center

NEW YORK - AUGUST 23: Professional tennis player Grigor Dimitrov from Bulgaria practices for US Open 2014 at Billie Jean King National Tennis Center on August 23 , 2014 in New York

NEW YORK - AUGUST 22, 2018: 13-time Grand Slam champion Novak Djokovic of Serbia practices for the 2018 US Open at Billie Jean King National Tennis

MIAMI GARDENS, FLORIDA - MARCH 27, 2023: Francisco Cerundolo of Argentina celebrates victory after round of 32 match against Felix Auger Aliassime of Canada at 2023 Miami Open at the Hard Rock Stadium in Miami Gardens, Florida, United States

NEW YORK - AUGUST 22, 2018: 13-time Grand Slam champion Novak Djokovic of Serbia practices for the 2018 US Open at Billie Jean King National Tennis

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 - AUGUST 27, 2017: Professional tennis player Lucas Pouille of France practices for US Open 2017 at Billie Jean King National Tennis Center in New York

NEW YORK - AUGUST 22, 2019: 20-time Grand Slam champion Roger Federer of Switzerland practices for the 2019 US Open at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 3, 2018: Grand Slam Champion Marin Cilic of Croatia in action during his 2018 US Open round of 16 match at Billie Jean King National Tennis Center

NEW YORK -SEPTEMBER 8: US Open 2014 champion Marin Cilic during final match against Kei Nishikori at Billie Jean King National Tennis Center on September 8, 2014 in New York

NEW YORK - AUGUST 22, 2018: 13-time Grand Slam champion Novak Djokovic of Serbia practices for the 2018 US Open at Billie Jean King National Tennis

NEW YORK - AUGUST 22, 2018: 13-time Grand Slam champion Novak Djokovic of Serbia practices for the 2018 US Open at Billie Jean King National Tennis

NEW YORK - SEPTEMBER 3, 2018: 13-time Grand Slam champion Novak Djokovic of Serbia in action during his 2018 US Open round of 16 match at Billie Jean King National Tennis Center

NEW YORK- SEPTEMBER 3, 2016: Twelve times Grand Slam champion Novak Djokovic of Serbia practices for for US Open 2016 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

NEW YORK - AUGUST 31, 2017: Professional tennis player Grigor Dimitrov of Bulgaria in action during his US Open 2017 second round match at Billie Jean King National Tennis Center

NEW YORK - AUGUST 22, 2018: 13-time Grand Slam champion Novak Djokovic of Serbia practices for the 2018 US Open at Billie Jean King National Tennis

NEW YORK - AUGUST 27, 2018: Grand Slam Champion Stanislas Wawrinka of Switzerland in action during his first round match at the 2018 US Open at USTA National Tennis Center

NEW YORK - SEPTEMBER 3, 2018: Grand Slam Champion Marin Cilic of Croatia in action during his 2018 US Open round of 16 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 3, 2018: Grand Slam Champion Marin Cilic of Croatia in action during his 2018 US Open round of 16 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 - AUGUST 22, 2018: 13-time Grand Slam champion Novak Djokovic of Serbia practices for the 2018 US Open at Billie Jean King National Tennis

NEW YORK - SEPTEMBER 5, 2016: Professional tennis player Ivo Karlovic of Croatia in action during US Open 2016 round four match at Billie Jean King National Tennis Center

NEW YORK - AUGUST 22, 2018: 13-time Grand Slam champion Novak Djokovic of Serbia practices for the 2018 US Open at Billie Jean King National Tennis