"Taylor Townsend is a nightmare" - Andy Roddick on why 'unpredictable' American is a big threat to Gauff, Sabalenka & others still alive at US Open

Taylor Townsend sailed through the first three rounds of the US Open, clinching dominant straight set wins over Antonia Ruzic, Jelena Ostapenko and Mirra Andreeva, to book a spot in the top 16.