Shuai Peng of Chine pulled off the biggest upset so far at the U.S. Open when she ousted fourth-seeded Agnieszka Radwanska in the second round.

Here’s what you need to know about her:

1. She’s From China

(Getty)

Peng, who was born in Hunan, China, is part of a growing group of Chinese players that also includes former World No. 1 Li Na.

When the 28-year-old Peng lost to Li in the final of the Shenzhen Open in January, it was the first time two Chinese women had met in the final of a sanctioned event.

ESPN reported:

With a population of more than 10 million, Shenzhen is one of the many cities fueling China’s tennis boom and sending sponsors flocking to Li, now a $40 million global brand. But the final of the 2014 Shenzhen Open was symbolic for reasons far greater than Li’s repeat. On the other side of the net was her Chinese rival Peng Shuai.

After taking the first set 6-4, Li lost four straight games in the second set, then rallied to win the match. As the women shook hands, a message crackled over the public-address system. “Ladies and gentlemen, this is very important and memorable,” an announcer told 4,000 fans packed into the Longgang Sports Center, their flashes popping. “Let’s use our video cameras to capture this moment.”

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2. She Hits Her Forehand & Backhand With 2 Hands

Peng is a rare player who hits both her forehand and backhand 2-handed.

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3. She’s Ranked 39th in the World

The 5-foot-10, 135-pound Peng is ranked 39th in the WTA singles rankings. She’s been ranked as high as No. 14 in her career.

Peng is coached by Frnchmen Guillaume Peyre, whose past clients include former Grand Slam finalist.

Peyre has also served as the coach of the Chinese national team.

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4. She Always Wears Pink

She’s known for her signature bright pink outfits, which she wore Wednesday when she upset Radwanska.

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5. She’s Won 16 WTA Doubles Titles

Peng has never won a WTA singles title, but she’s won 16 doubles titles, including four this year.