New York - 21 augustus 2018: Professionele tennisspeelster Alexander Zverev van Duitsland in de praktijk voor 2018 Us Open op Billie Jean King National Tennis Center - Stockfoto’s en -afbeeldingen

NEW YORK - AUGUST 21, 2018: Professional tennis player Alexander Zverev of Germany in practice for 2018 US Open at Billie Jean King National Tennis Center

NEW YORK - AUGUST 21, 2018: Professional tennis player Alexander Zverev of Germany in practice for 2018 US Open at Billie Jean King National Tennis Center

NEW YORK - AUGUST 21, 2018: Professional tennis player Alexander Zverev of Germany in practice for 2018 US Open at Billie Jean King National Tennis Center

NEW YORK - AUGUST 21, 2018: Professional tennis player Alexander Zverev of Germany in practice for 2018 US Open 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 21, 2018: Professional tennis player Alexander Zverev of Germany in practice for 2018 US Open at Billie Jean King National Tennis Center

NEW YORK - AUGUST 21, 2018: Professional tennis player Alexander Zverev of Germany in practice for 2018 US Open at Billie Jean King National Tennis Center

NEW YORK - AUGUST 29, 2016: Grand Slam champion Rafael Nadal of Spain in action during US Open 2016 first round match at Billie Jean King National Tennis Center

NEW YORK - AUGUST 21, 2018: Professional tennis player Alexander Zverev of Germany in practice for 2018 US Open at Billie Jean King National Tennis Center

NEW YORK - AUGUST 27, 2016: Professional tennis player Alexander Zverev of Germany in action during his second round US Open 2016 match at Billie Jean King National Tennis Center in New York

NEW YORK - AUGUST 31, 2019: Professional tennis player Alexander Zverev of Germany in action during his 2019 US Open third round match at Billie Jean King National Tennis Center

NEW YORK - AUGUST 21, 2018: Professional tennis player Alexander Zverev of Germany in practice for 2018 US Open at Billie Jean King National Tennis Center

NEW YORK - AUGUST 21, 2018: Professional tennis player Alexander Zverev of Germany in practice for 2018 US Open at Billie Jean King National Tennis Center

NEW YORK - AUGUST 21, 2018: Professional tennis player Alexander Zverev of Germany in practice for 2018 US Open at Billie Jean King National Tennis Center

NEW YORK - AUGUST 21, 2018: Professional tennis player Alexander Zverev of Germany in practice for 2018 US Open at Billie Jean King National Tennis Center

NEW YORK - AUGUST 27, 2019: Professional tennis player Stefanos Tsitsipas of Greece in action during his 2019 US Open first round match at Billie Jean King National Tennis Center in New York

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

FLUSHING, NY - AUGUST 26 Twelve times Grand Slam champion Rafael Nadal during his first round match at US Open 2013 against Ryan Harrison at Arthur Ashe Stadium on August 26, 2013 in Flushing, NY

NEW YORK - AUGUST 26, 2017: Professional tennis player Alexander Zverev of Germany in practice for 2017 US Open at Billie Jean King National Tennis Center

NEW YORK- SEPTEMBER 2: Twelve times Grand Slam champion Rafael Nadal during fourth round match at US Open 2013 against Philipp Kohlschreiber at Arthur Ashe Stadium on September 2, 2013 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 - AUGUST 21, 2018: Professional tennis player Alexander Zverev of Germany in practice for 2018 US Open at Billie Jean King National Tennis Center

NEW YORK - AUGUST 31 Twelve times Grand Slam champion Rafael Nadal during third round singles match against Ivan Dodig at US Open 2013 at Billie Jean King National Tennis Center on August 31, 2013 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 - AUGUST 21, 2018: Professional tennis player Alexander Zverev of Germany in practice for 2018 US Open at Billie Jean King National Tennis Center