Our gallery takes you through the fun and games from day nine at the US Open at Flushing Meadows.
Defending champion Sloane Stephens surrendered her crown, and it hurt.
… but for Anastasija Sevastova it was a day to remember.
NEW YORK, NY - SEPTEMBER 04: Anastasija Sevastova of Latvia celebrates at match point during the ladies singles quarter-final match against Sloane Stephens of The United States on Day Nine of the 2018 US Open at the USTA Billie Jean King National Tennis Center on September 4, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Al Bello/Getty Images)
There was heartbreak for another American, John Isner too, as he found Juan Martin del Potro just too good.
NEW YORK, NY - SEPTEMBER 04: John Isner of The United States reacts during the men's singles quarter-final match against Juan Martin Del Potro of Argentina on Day Nine of the 2018 US Open at the USTA Billie Jean King National Tennis Center on September 4, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Elsa/Getty Images)
Beating the American number one didn’t seem to dent the Argentinian’s incredible relationship with the New York crowd, though.
NEW YORK, NY - SEPTEMBER 04: Juan Martin Del Potro of Argentina celebrates during the men's singles quarter-final match against John Isner of The United States on Day Nine of the 2018 US Open at the USTA Billie Jean King National Tennis Center on September 4, 2018 in the Flushing neighborhood of the Queens borough of New York City. (Photo by Al Bello/Getty Images)
Arthur Ashe Stadium is always a special place when Serena Williams plays.
And she obliged by beating Karolina Pliskova.
US Serena Williams celebrates after defeating Czech Republic's Karolina Pliskova during their Women's Singles Quarter-Finals match at the 2018 US Open at the USTA Billie Jean King National Tennis Center in New York on September 4, 2018. (Photo by EDUARDO MUNOZ ALVAREZ / AFP) (Photo credit should read EDUARDO MUNOZ ALVAREZ/AFP/Getty Images)
Up next it was the latest instalment in the budding rivalry between Rafael Nadal and Dominic Thiem.
Spain's Rafael Nadal (R) and Austria's Dominic Thiem (L) meet at the net for the coin toss before their Men's Singles Quarter-Finals match at the 2018 US Open at the USTA Billie Jean King National Tennis Center in New York on September 4, 2018. (Photo by EDUARDO MUNOZ ALVAREZ / AFP) (Photo credit should read EDUARDO MUNOZ ALVAREZ/AFP/Getty Images)
The Austrian started brilliantly, and won the first set 6-0.
Dominic Thiem celebrates
But Nadal was never going to give it up easily and came roaring back.
Spain's Rafael Nadal hits a return to Austria's Dominic Thiem during their Men's Singles Quarter-Finals match at the 2018 US Open at the USTA Billie Jean King National Tennis Center in New York on September 4, 2018. (Photo by EDUARDO MUNOZ ALVAREZ / AFP) (Photo credit should read EDUARDO MUNOZ ALVAREZ/AFP/Getty Images)
It went the distance before Nadal wrapped it up in four hours and 49 minutes.
