MELBOURNE, Jan. 24 -- China's Wang Qiang toppled tennis legend Serena Williams at the Australian Open on Friday, while defending champion, Naomi Osaka bowed out to 15-year-old Coco Gauff in the third round.

In a day of upsets for the champions, Williams lost to Wang, 6-4, 6-7 (2), 7-5, and Osaka crumbled to youngster Gauff, 6-3, 6-4.

Meanwhile former world No. 1 Caroline Wozniacki ended her tournament, and her career, after losing to Tunisian, Ons Jabeur, 7-5, 3-6, 7-5.

The Danish Grand Slam winner always planned to retire after this year's event and said that the reception from fans and her family after the match provided a fitting end.

"It was a packed stadium, people were clapping, I had the Danish flag at my back and I had my family there," Wozniacki said.

"I don't think I could have scripted it any better. I think it was the perfect moment."

At the same time Wozniacki was ending her illustrious career, long time friend and competitor, Williams was suffering the tournament's biggest upset so far at the hands of China's No. 1 player, Wang.

The last time the pair met was at the 2019 U.S. Open quarterfinals, when Williams demolished the Chinese contender 6-1, 6-0.

Despite being ruled out by most observers, Wang showed early on that she meant business, moving Williams around the court and withstanding the champion's devastating returns.

Wang said that time in the gym along with belief in herself, and from her team, helped her play a vastly different match this time around.

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