Explained in plain English

What's a 'set' in tennis?

A tennis match is divided into 'sets', and each set is made up of 'games'. To win a set, a player usually needs to win at least six games and be ahead by two clear games. Zheng Qinwen's comeback from 5-0 down in the first set against Swiatek shows incredible resilience, as she had to win seven games in a row to take it.