Seven-time Grand Slam winner Venus Williams held off Britain's Heather Watson 6-4, 4-6, 6-0 on Thursday to reach the quarterfinals of the WTA hardcourt tournament in San Jose, California.
Third-seeded Williams is the highest seed left in a tournament that saw second-seed Madison Keys follow top-seeded Garbine Muguruza in pulling out because of injury on Thursday.
Keys, the defending champion, pulled out with a right wrist injury before taking the court for her second-round opener against Australia's Ajla Tomljanovic.
Williams will take on Greece's Maria Sakkari, who dominated eighth-seeded Hungarian Timea Babos 6-0, 6-1.
Williams, who won the title in this event in 2000 and 2002, came back with a vengeance after dropping the second set to Watson. She broke the Briton three times in the final set, dropping just four points on her serve.
“It was a tough match and she played incredible. There were times where I had no answers,” said Williams, who said her goal was to “control the points and enjoy the battle, just get out there and try to do what I know that I can.
“It worked out, thankfully.”
Williams, now the highest-ranked player in the draw, will kick off Thursday's night session against Great Britain's Heather Watson.
Buzarnescu said she felt the pressure against qualifier Anisimova.
“She's from the new generation, and I'm from the old one, and I knew the pressure would be on me because she has nothing to lose,” the Romanian said.
The other two quarterfinal match-ups were decided on Wednesday, when Britain's Johanna Konta followed up her stunning defeat of Serena Williams with a straight-sets victory over US teenager Sofia Kenin to book a meeting with fourth-seeded Elise Mertens of Belgium.
American Daniell Collins will take on former world number one Victoria Azarenka for a place in the semifinals.
- Full list of highest T20I totals successfully chased against India: Australia sets new record in Guwahati
- IND vs AUS: Deepak Chahar added to India’s squad for T20I series against Australia
- PCB waives off 50 per cent match fee fine imposed on Azam Khan for displaying Palestine flag
- IND vs AUS: Maxwell concedes 30 runs off last over as India scores mammoth 222 against Australia in 3rd T20I
- Ruturaj Gaikwad smashes maiden international century; becomes first Indian to score T20I hundred against Australia