Νέα Υόρκη-22 Αυγούστου 2018: Αμερικανός συνταξιούχος επαγγελματίας παίκτης του τένις Τζέιμς Μπλέικ σε δράση κατά τη διάρκεια της 2018 μας παιχνίδι ανοιχτή έκθεση στο νέο ανοιχτό στάδιο Louis Άρμστρονγκ στο εθνικό κέντρο τένις - Φωτογραφίες & Εικόνες Αρχείου

NEW YORK - AUGUST 22, 2018: American retired professional tennis player James Blake in action during 2018 US Open exhibition match at newly open Louis Armstrong Stadium at National Tennis Center

NEW YORK - AUGUST 22, 2018: American retired professional tennis player James Blake in action during 2018 US Open exhibition match at newly open Louis Armstrong Stadium at 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 22, 2018: American retired professional tennis player James Blake in action during 2018 US Open exhibition match at newly open Louis Armstrong Stadium at National Tennis Center

NEW YORK - AUGUST 22, 2018: American retired professional tennis player James Blake in action during 2018 US Open exhibition match at newly open Louis Armstrong Stadium at 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 19: Two times Grand Slam Champion Lleyton Hewitt practices for US Open 2014 at Arthur Ashe Stadium at Billie Jean King National Tennis Center on August 19 , 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 - 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 24: Six times Grand Slam champion Novak Djokovic practices for US Open 2014 at Billie Jean King National Tennis Center on August 24 , 2014 in New York

NEW YORK -SEPTEMBER 2, 2014: US Open 2014 champion Marin Cilic from Croatia during US Open 2014 round 4 match against Gilles Simon at Billie Jean King National Tennis Center in New York

NEW YORK - SEPTEMBER 3, 2015: Professional tennis player Hyeon Chung of Korea in action during his second round match at US Open 2015 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 - AUGUST 21: Six times Grand Slam champion Novak Djokovic practices for US Open 2014 at Billie Jean King National Tennis Center on August 21, 2014 in New York

NEW YORK -SEPTEMBER 6, 2016: Grand Slam champion Mike Bryan in action during US Open 2016 quarterfinal doubles match at Billie Jean King National Tennis Center in New York

NEW YORK - AUGUST 20, 2019: 18-time Grand Slam champion Rafael Nadal of Spain practices for the 2019 US Open at Billie Jean King National Tennis Center

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 - SEPTEMBER 2, 2019: Professional tennis player Matteo Berrettini of Italy in action during the 2019 US Open round of 16 match against Andrey Rublev at Billie Jean King Tennis Center