Carlos Alcaraz lost the opening set to Jaime Faria and then won twelve of the next fourteen games, taking the match 4-6, 6-0, 6-3, 6-2. It is his second match back from the wrist injury that kept him out for four months, and the first set is the sort of thing that gets forgiven quickly when the reply is a bagel.
Aryna Sabalenka needed barely an hour against Polina Iatcenko, winning 6-1, 6-1, and Jessica Pegula beat Sofia Kenin 6-3, 6-1 with similar economy.
On the men's side Ben Shelton came through the longest match of the group, beating Hubert Hurkacz 6-3, 5-7, 7-6, 7-5, and Frances Tiafoe beat Rei Sakamoto 6-3, 7-6, 7-5.
Summarised by TennisArena from reporting by CBS Sports.