Is the old Zheng Qinwen back – or is she perhaps getting even better?

Sideline Story breaks down Zheng Qinwen's extraordinary performance at the US Open – two comeback wins from 5-0 down, including a deciding-set thriller against Madison Keys – after an injury-hit season and a spirited run through qualifying.

We analyze her upgraded technical toolbox and the point-by-point mentality that powered her deep run in New York.

In addition, Carlos Alcaraz’s US Open exit showed that he remains rusty after a months-long injury layoff, while Novak Djokovic’s physical struggles in a stunning first-round defeat raises hard questions about his best-of-five future.