CoCo Vandeweghe strolled into the second round of the Stanford Classic on Tuesday after her opponent Ajla Tomljanovic was forced to retire through injury.
Sixth seed Vandeweghe had just won the first set 6-2 when the Australian had to quit with just 31 minutes played.
"It was disappointing to have a retirement today, but I thought I was playing well to get to the point of winning the first set," Vandeweghe said afterwards.
— WTA (@WTA) August 1, 2017
She will face compatriot Nicole Gibbs in the second round.
In other action, CiCi Bellis defeated Alizé Cornet of France 6-3, 6-2.
Teenager Bellis, the world number 44 who is seeded eighth this year, took just one hour and 17 minutes to wrap up the win after breaking the Cornet’s serve four times.
"I'm so happy to be back here!" Bellis exclaimed on court. "I think I'm on the right path now…I think I played great, Alizé is such a great player."
She faces Paraguayan qualifier Veronica Cepede Royg in round two after Royg defeated another home player, Kristie Ahn 2-6, 7-5, 6-1.
Other first-round matches saw American qualifier Caroline Dolehide defeat Japan's Naomi Osaka 6-4, 6-2 to set up a second-round tie with third seed Madison Keys, while Alison Riske beat Poland's Magda Linette, 6-2, 6-4 and will face Russia’s Anastasia Pavlychenkova in the second round.