UPDATE 1-Tennis-Blistered Halep beaten by Vondrousova at Indian Wells

World number two Simona Halep was run ragged and dumped out of the BNP Paribas Open by Czech teenager Marketa Vondrousova 6-2 3-6 6-2 in the fourth round at Indian Wells on Tuesday. Halep, who received medical treatment for blisters on her foot during the match, won less than half of her first-service points and hit just six winners to go with 36 unforced errors.

"I was running too much and too defensive," the Romanian told reporters. "But it's everything I could do today." Halep's loss ensures that Japan's Naomi Osaka, who is currently playing Belinda Bencic, will retain her world number one ranking after the tournament. The win was 19-year-old Vondrousova's first over a top-10 player in six attempts. "I think I'm playing well all week but this is something special because she's number two in the world," Vondrousova said. "I was just fighting for every point."

Another teenager, unseeded Canadian Bianca Andreescu, upset 18th seed Wang Qiang of China 7-5 6-2 to book her place in the quarters. The win was the 18-year-old Andreescu's 25th of the year, the most of any WTA player. She will next face Garbine Muguruza after the Spaniard battled back to dispatch Kiki Bertens of the Netherlands 5-7 6-1 6-4. Ukrainian Elina Svitolina came from a break down in the third set to defeat Australian Ashleigh Barty 7-6(8) 5-7 6-4 to reach the quarter-finals for the first time.