INDIAN WELLS, CA, USA – Denisa Allertova played fearless tennis to complete the day’s biggest upset, taking out No.2 seeded Angelique Kerber in straight sets in the second round of the BNP Paribas Open.

Watch highlights, interviews and more video from Indian Wells right here on wtatennis.com!

The No.64-ranked Czech had only notched one win against a Top 5 player in her career, taking out Halep last year in Guangzhou, and was playing in her first main draw match at Indian Wells. But she didn’t let the occasion – or Kerber’s rock solid tennis – get to her.

Things seemed to start off going the way of the reigning Australian Open champion early on in the match, Kerber breaking Allertova in the very first game. The German used her defensive counterpunching to keep giving Allertova one more ball until the Czech began to let the errors loose.

But Allertova quickly set aside any early jitters and settled into her trademark high risk game, employing her vicious angles and changing the pace to keep Kerber second-guessing. She broke right back and kept pace with the World No.2, making every game a long battle.

Just as it seemed like Kerber would serve to send the set into a tiebreak, Allertova employed some of her best tennis of the match to bring up a pair of set points. Kerber erased one with a pinpoint accurate crosscourt backhand, but she couldn’t withstand Allertova’s deadly line-to-line game, being dragged all around the court until getting caught by a passing shot to seal the opening set.

Things started to turn around for Kerber in the second set as the German broke to love to grab a 3-2 lead. That quickly became a 5-3 hole as Kerber found a way to keep Allertova’s high risk game in check; Allertova hit just 12 winners this set, compared to the 25 she hit in the previous one. But she did just enough, breaking twice and knocking out the No.2 seed 7-5, 7-5.

Still soaking it all in, the 23-year-old from Prague could barely put the win into words.

“I just tried to play and just focus on every point, tried moving and playing into the court… I don’t know, I just tried to play my best!” she said in her post-match interview. “Just amazing feelings right now because she’s an amazing player.”

“I tried to play my best and I’m so happy that I won today. It’s an amazing feeling.”

Huge win for Denisa Allertova!

Knocks out Australian Open champ Angelique Kerber! #WTA https://t.co/Wj8JhHSX31

— WTA (@WTA) March 12, 2016

The No.6 seed Carla Suárez Navarro wasn’t so lucky today as she saw herself having to bow out of the tournament due to a right ankle injury.

“I twist my ankle yesterday and today I tried to warm up but I’m not 100%,” Suárez Navarro told wtatennis.com. “So I will try to rest, recover and be ready for Miami.”

She was replaced in the draw by lucky loser Anna-Lena Friedsam, who’s set to square off against Daria Kasaktina of Russia.