New york - september 2, 2018: die 23-malige Grand-Slam-Siegerin serena williams in aktion während ihres us-open-16 match im billie jean king national tennis center - Stockfoto & -bild

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 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 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: 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 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 - AUGUST 26, 2019: Grand Slam champion Serena Williams in action during 2019 US Open first round match against Maria Sharapova 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 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 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 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 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: 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 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 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 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 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 - AUGUST 26, 2019: Grand Slam champion Serena Williams of United States in action during 2019 US Open semi-final match against Elina Svitolina at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 3, 2016: Grand Slam champion Serena Williams of United States in action during her round three match at US Open 2016 at Billie Jean King National Tennis Center in New York

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 1, 2019: Grand Slam champion Serena Williams in action during her 2019 US Open round of 16 match at Billie Jean King National Tennis Center

NEW YORK - SEPTEMBER 8, 2015: Twenty one times Grand Slam champion Serena Williams in action during her quarterfinal match against Venus Williams at US Open 2015 at National Tennis Center in New York

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, 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 - 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, 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 30, 2016: Grand Slam champion Serena Williams in action during first round match at US Open 2016 at Billie Jean King National Tennis Center in New York

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

NEW YORK - AUGUST 30, 2016: Grand Slam champion Serena Williams in action during her semifinal match at US Open 2016 at Billie Jean King National Tennis Center in New York

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