Caroline Wozniacki blew any chance she had to overtake Simona Halep as world number one after losing 6-4 7-5 to Darya Kasatkina in the fourth round of the BNP Paribas Open at Indian Wells on Tuesday.
In other women's matches, eighth seeded Venus Williams survived a stern test from Latvia's Anastasija Sevastova to win 7-6 (8/6), 6-4 and fifth-seeded Karolina Pliskova beat Amanda Anisimova of the U.S. 6-1, 7-6 (7/2).
The 26-year-old Romanian showed no sign of the foot injury that forced her to withdraw from the Qatar Total Open in Doha last month and is well positioned to make a run at reclaiming the Indian Wells title she won in 2015.
No. 32 Milos Raonic of Canada defeated Joao Sousa of Portugal 7-5, 4-6, 6-2 and will meet Marcos Baghdatis of Cyprus, who beat lucky loser Dudi Sela of Israel 7-6 (7), 6-4. Halep needs to be at her best moving forward.
"Not taking the ranking because she didn't play tournaments, but just protected ranking for - I don't know how many tournaments you have, like, eight".
The 37-year-old American was coming off a straight-set victory over younger sister Serena a night earlier, ending a three-match skid against her sibling.
"She outsmarted me", Wozniacki said.
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Kasatkina said she is starting to believe in herself, especially when she faces top 10 players. Halep reclaimed the ranking just before Indian Wells. "So quite a simple rule".
Williams, who has yet to drop a set, will face either Carla Suarez Navarro or Danielle Collins in the last eight.
The first Croat to reach the round 16 at Indian Wells since 1997 when Iva Majoli lost to Venus Williams collecting her first top 10 win, beat 6-3 7-6 Marketa Vondrousova.
The 20-year-old Kasatkina improved to 11-6 on the WTA Tour season as she seeks to better her quarter-final appearance here in 2016.
She said Serena Williams - who made her return at this year's tournament after having a baby in September - "should have been seeded number one, because she left as number one in the world".
Halep can hold onto the top ranking by reaching the final here. "I did exactly what he said after that". I think this will change a little bit in the future, but for sure the game is good and not really any weakness.
Pliskova advances to the quarter-finals where she will face Naomi Osaka of Japan who beat unseeded Maria Sakkari 6-1, 5-7, 6-1. I just want to have the plan what I have to do.