Americans John Isner and Sloane Stephens earned wins Tuesday, booking spots into the next rounds of the BNP Paribas Open.
Isner downed Yen-Hsun Lu in straight sets, 6-4, 6-3.
"I'm not known for real comprehensive matches, so it's good to get out here and get off the court quickly," Isner said after the match.
The No. 12 seed in the tournament started the match with an ace and finished it with an ace.
"That's my weapon," Isner said. "I served well so far this week, and I'm going to have to continue to do so if I want to keep progressing in this tournament."
Meanwhile, Sloane Stephens survived a late charge by Russian Alisa Kleybanova advancing to the quarterfinals 6-3, 7-5.
Stephens is the first American woman to make the Indian Wells quarterfinals since 2008.
"Yeah, that's cool. I'm glad to be doing well here," Stephens said. "Obviously I haven't made it past the second round here ever. It's good to be in the quarterfinals."
Stephens said she does not feel the pressure build as tournaments progress.
"I think at the beginning of the tournament is when you have like the most nerves," Stephens said. "Then once you get going, you're like, The person I'm playing has done well, you're both playing well, so it's good we are this deep in."
Earlier in the day, American Lauren Davis, who defeated a hobbled Victoria Azarenka in the second, withdrew from the tournament with a gastrointestinal illness.
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