Serena Williams advanced to the women's semifinals with a win over Tsvetana Pironkova at the 2020 US Open. (Photo by Pete Staples/USTA)
Serena Williams returns a shot against Tsvetana Pironkova during their quarterfinal match at the 2020 US Open. (Photo by Simon Bruty/USTA)
Tsvetana Pironkova in action against Serena Williams during their women's quarterfinal match at the 2020 US Open. (Photo by Simon Bruty/USTA)
Serena Williams hits a leaping return against Tsvetana Pironkova. (Photo by Simon Bruty/USTA)
Tsvetana Pironkova in action against Serena Williams. (Photo by Simon Bruty/USTA)
Serena Williams follows through on a shot against Tsvetana Pironkova. (Photo by Simon Bruty/USTA)
Tsvetana Pironkova hits against Serena Williams. (Photo by Simon Bruty/USTA)
Serena Williams hustles during her quarterfinal match against Tsvetana Pironkova. (Photo by Simon Bruty/USTA)
Tsvetana Pironkova during her quarterfinal match against Serena Williams. (Photo by Simon Bruty/USTA)
Serena Williams taps racquets with Tsvetana Pironkova after winning their quarterfinal match on Day 10. (Photo by Pete Staples/USTA)
