16-year-old American upsets Kvitova in Indian Wells

3/12/2018 8:28:44 AM EST

Amanda Anisimova announced her presence on the WTA Tour in a big way Sunday.

The 16-year-old New Jersey native earned her first two tour victories the past few days, then stepped up a level by upsetting ninth-seeded Petra Kvitova of the Czech Republic 6-2, 6-4 in the third round of the BNP Paribas Open at Indian Wells, Calif.

Kvitova, a two-time Wimbledon champion, was riding a 14-match winning streak before running into the young American.

"It feels crazy. I mean, I'm still in shock," Anisimova said. "She's the best player I have ever played, and it was the biggest court I have ever played on. So it was definitely nerve-wracking kind of, but I was enjoying it so much out there and I was playing my best. It was a good day. ...

"I was just trying to stay focused, but at the same time I was thinking, 'Oh my god.'"

Anisimova enjoyed a strong junior career while preparing for the big stage. She reached the 2016 French Open junior final, then won the junior title at the U.S. Open last summer.

"I'm really aggressive, and I like to take the ball away. So I feel like opponents have a tough time managing my power sometimes," Anisimova said, according to tennis.com. "I think that's a big advantage I have."

Anisimova, whose WTA Tour ranking is No. 149, will oppose another Czech player, Karolina Pliskova, in the fourth round. Pliskova, the fifth seed, topped 32nd-seeded Shuai Zhang of China 7-5, 5-7, 6-3 on Sunday.

In a match that took a day to complete, 10th-seeded Angelique Kerber of Germany rallied past Ekaterina Makarova of Russia 3-6, 6-4, 6-2. Makarova won the first set and was serving to open the second set Saturday night when play was suspended due to rain. Kerber reversed her fortunes the next afternoon.

American Sloane Stephens, the 13th seed, also had her scheduled match against Belarus' Victoria Azarenka pushed back from Saturday night to Sunday afternoon, though that contest had yet to start before the rains came. Stephens emerged with a 6-1, 7-5 victory.

Top-seeded Simona Halep of Romania rallied to defeat 165th-ranked American Caroline Dolehide 1-6, 7-6 (3), 6-2.

Petra Martic of Croatia upset sixth-seeded Jelena Ostapenko of Latvia 6-3, 6-3. China's Qiang Wang routed France's Kristina Mladenovic, the 14th seed, 6-1, 6-2, and Greece's Maria Sakkari eliminated 17th-seeded American CoCo Vandeweghe 6-2, 6-4.

--Field Level Media