Angelique Kerber will return to the top of the world rankings next week despite being bundled out of the WTA tournament in Indian Wells.
The German fell to 14th-seeded Elena Vesnina 6-3 6-3 in the fourth round.
Venus Williams advanced to the quarter-finals at Indian Wells for the first time since 2001 with a 3-6 6-1 6-3 victory over Shuai Peng, winning the final four games of the match.
"It was so frustrating," Williams said. "But I feel like I got my focus more in that second set and towards the end of the third because I'm just a competitor.
"If things get closer, then I think my better tennis is going to come."
Williams ended her 15-year boycott of the event last year, when she lost in the second round.
Elsewhere, No. 3 seed Karolina Pliskova advanced when 15th-seeded Timea Bacsinszky retired trailing 5-1 in the first set and French Open champion Garbine Muguruza of Spain defeated No.10 seed Elina Svitolina 7-6 (7-5) 1-6 6-0.
Anastasia Pavlyuchenkova outlasted No.5 seed Dominika Cibulkova 6-4 3-6 6-3 while No.8 seed Svetlana Kuznetsova beat Caroline Garcia 6-1 6-4.
Kristina Mladenovic of France cruised past American Lauren Davis 6-3 6-3 while Madison Keys is taking on Caroline Wozniaki in the remaining round of 16 encounter.
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