Zheng cruised to a 6-1, 6-1 win over Jasmine Paolini to qualify second in the Orange Group behind Aryna Sabalenka, seeking to be the first player since Williams to win the Olympics and the WTA Finals in the same year.

The Paris Olympics champion dropped just two games, firing 12 aces along the way Wednesday.

There have been four days of play, and all eight women have finished two matches. Here are five thoughts on what we’ve seen so far.