NEW YORK SYYSKUU 6, 2018: Ammattimainen tennispelaaja Naomi Osaka toiminnassa hänen 2018 US Open semifinaali ottelussa Billie Jean King National Tennis Center - Kuvapankin valokuva ja kuva

NEW YORK - SEPTEMBER 2, 2018: 23-time Grand Slam champion Serena Williams in action during her 2018 US Open round of 16 match at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 6, 2018: Professional tennis player Naomi Osaka in action during her 2018 US Open semi-final match at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 6, 2018: Professional tennis player Naomi Osaka in action during her 2018 US Open semi-final match at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 6, 2018: Professional tennis player Naomi Osaka in action during her 2018 US Open semi-final match at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 9, 2017: US Open 2017 champion Sloane Stephens of United States in action during her final match against Madison Keys at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 6, 2018: Professional tennis player Naomi Osaka in action during her 2018 US Open semi-final match at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 6, 2018: Professional tennis player Naomi Osaka in action during her 2018 US Open semi-final match at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 5, 2016: Grand Slam champion Serena Williams of United States in action during her round four match at US Open 2016 at Billie Jean King National Tennis Center in New York

NEW YORK - SEPTEMBER 6, 2018: Professional tennis player Naomi Osaka celebrates victory after 2018 US Open semi-final match at Billie Jean King National Tennis Center

NEW YORK - AUGUST 27, 2018: 23-time Grand Slam champion Serena Williams in action during her 2018 US Open first round match at Billie Jean King National Tennis Center

NEW YORK - AUGUST 27, 2019: Professional tennis player 15-year-old Coco Gauff of United States in action during her 2019 US Open first round match at Billie Jean King National Tennis Center

NEW YORK - AUGUST 31, 2015: Twenty one times Grand Slam champion Serena Williams in action during first round match at US Open 2015 at National Tennis Center in New York

NEW YORK - AUGUST 31, 2019: Professional tennis player 15-year-old Coco Gauff of United States in action during her 2019 US Open third round match at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 6, 2018: Professional tennis player Naomi Osaka in action during her 2018 US Open semi-final match at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 6, 2018: Professional tennis player Naomi Osaka in action during her 2018 US Open semi-final match at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 3, 2017: Grand Slam champion Venus Williams of United States in action during her round 4 match at 2017 US Open at Billie Jean King National Tennis Center in New York

NEW YORK - SEPTEMBER 6, 2018: 23-time Grand Slam champion Serena Williams in action during her 2018 US Open semi-final match at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 6, 2018: Professional tennis player Naomi Osaka in action during her 2018 US Open semi-final match at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 6, 2018: Professional tennis player Naomi Osaka in action during her 2018 US Open semi-final match at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 3, 2017: Grand Slam champion Venus Williams of United States in action during her round 4 match at 2017 US Open at Billie Jean King National Tennis Center in New York

NEW YORK - SEPTEMBER 9, 2017: US Open 2017 champion Sloane Stephens of United States in action during her final match against Madison Keys at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 3, 2017: Grand Slam champion Venus Williams of United States in action during her round 4 match at 2017 US Open at Billie Jean King National Tennis Center in New York

NEW YORK - AUGUST 22, 2018: 23-time Grand Slam champion Serena Williams practices for the 2018 US Open at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 3, 2017: Grand Slam champion Venus Williams of United States in action during her round 4 match at 2017 US Open at Billie Jean King National Tennis Center in New York

NEW YORK - SEPTEMBER 8, 2018: 23-time Grand Slam champion Serena Williams broke tennis racket during her 2018 US Open final match at Billie Jean King National Tennis Center

NEW YORK - AUGUST 27, 2018: 23-time Grand Slam champion Serena Williams in action during her 2018 US Open first round match at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 2, 2018: 23-time Grand Slam champion Serena Williams in action during her 2018 US Open round of 16 match at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 5, 2016: Grand Slam champion Serena Williams of United States in action during her round four match at US Open 2016 at Billie Jean King National Tennis Center in New York

NEW YORK - AUGUST 31, 2019: Grand Slam Champion Naomi Osaka of Japan in action during her 2019 US Open third round match at Billie Jean King National Tennis Center

NEW YORK - AUGUST 27, 2018: 23-time Grand Slam champion Serena Williams in action during her 2018 US Open first round match at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 6, 2015: Twenty one times Grand Slam champion Serena Williams in action during her round four match at US Open 2015 at National Tennis Center in New York

NEW YORK - AUGUST 22, 2018: 23-time Grand Slam champion Serena Williams practices for the 2018 US Open at Billie Jean King National Tennis Center