Serena Williams facing Tsvetana Pironkova is a US Open 2020 quarterfinal that was unexpected pre-tournament. Pironkova’s run in the 2020 US Open caught the most attention. Returning to the tour after three years and playing her first tournament since becoming a mother, Pironkova only dropped one set so far heading into this Quarterfinal match with Williams. Meanwhile, Serena Williams is a more expected feature with Williams still on the hunt for her record-equalling 24th Grand Slam victory.

This set up what has the potential to be a difficult quarterfinal to predict!

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