By Shrivathsa Sridhar MELBOURNE (Reuters) -Zheng Qinwen was the first big name to exit the women's draw at the Australian Open on Wednesday after the Olympic champion was stunned by Laura Siegemund while top seed Aryna Sabalenka made heavy weather of her second-round match before going through.

The world no 20 took the first set with ease, yet Osaka hit back to prevail 1-6 6-1 6-3 in front of a vociferous crowd at Melbourne Park

Two-time Australian Open champion Naomi Osaka says she took out a "little revenge" after coming back to beat Czech 20th seed Karolina Muchova.

Zheng Qinwen admits it was not her day as she was beaten in the Australian Open second round in the biggest shock of the tournament so far.

Osaka's triumph over Muchova will now see her make her first appearance in the third round of a grand slam since the 2022 Australian Open.

MELBOURNE - Naomi Osaka said she was enjoying a little bit of revenge against Karolina Muchova at the Australian ... reach the third round at Melbourne Park, turned heads at Flushing Meadows ...

Japan's Naomi Osaka celebrates winning her second round match against Czech Republic's Karolina Muchova on January 15 ... the 20th seed 1-6 6-1 6-3 and reach the third round at Melbourne Park, turned heads at Flushing Meadows last August with a tennis ...