US Open day eight: Dominic Thiem and Serena Williams qualify for quarter-finals

Thiem was joined in the last night by the impressive Daniil Medvedev

Dominic Thiem is through to the US Open quarter-final and is now the man to beat. Picture: Seth Wenig/AP

Second seed Dominic Thiem progressed to the quarter-finals of the US Open, where he was joined by a hugely impressive Daniil Medvedev.

On the women’s side, Serena Williams also made it to familiar territory, but second seed Sofia Kenin crashed out to Elise Mertens.