US Open 2020: Serena Williams overcomes Tsvetana Pironkova to reach semi-finals
10 Sep 2020
BBC Sport
Mother of all battles: Serena beats Pironkova to reach US Open semis"News24US Open 2020: Serena Williams Comes Back From A Set Down To Reach Semi-Finals"NDTVSports.comSerena Williams survives Tsvetana Pironkova scare to reach US Open semis"New York Post V