She next faces either Kiki Bertens of the Netherlands or American Nicole Gibbs for a place in the last 16. It's the first time that the French woman has ever beaten the German in her career.
The 15-year-old, who is ranked 521 in the world, was given a wild card into qualifying after winning the junior title last year, and this is her first main draw at any WTA-level tournament.
In the match preceding Nadal and Mayer on Rod Laver Arena, Wozniacki felt like she was "one foot out the tournament" before winning six straight games to advance.
The Dane reeled off four points in a row to get to 5-2 and then never looked back, racing through the next five games in just 20 minutes.
"I'm just relieved to be through".
Before the start of this week Kostyuk's total career prize money was $6,733, but she already has plans for the bumper $142,500 pay day she will earn even if she loses to Svitolina in the third round.
She beat two top-10 players to take the trophy.
Republican running for NY governor wants recreational marijuana to fund projects
He spoke last among the parade of more than 15 politicians in Harlem, more than two hours after Cuomo. Cuomo said offsetting the loss of the property tax deduction would be more hard .
Another high seed got pushed to three sets in her second-round match, as No. 4 Elina Svitolina of Ukraine defeated the Czech Republic's Katerina Siniakova 4-6, 6-2, 6-1.
The explosive Aussie was always in control of his match against Viktor Troicki 7-5, 6-4, 7-6. "That was insane, I don't how I got back the in the match", she said. "I don't know how I got back into the match".
Switzerland's Belinda Bencic upset fifth seed Venus Williams in the first round of the women's singles competition in the Australian Open tennis tournament here on Monday. Nadal had a slight hiccup, getting broken serving for the match at 5-4, but dominated the tiebreak to close it out on his first match point. The World No.119 was not fazed by the retaliation though, breaking the Wozniacki serve for the second time to lead 2-1. Her fellow Ukrainian Kateryna Bondarenko beat No.
Alize Cornet of France beat No. 12-seeded Julia Goerges of Germany 6-4, 6-3.
The topic of grunting is back in the headlines after 19-year-old Belarusian Arnya Sabalenka found herself mercilessly mocked by the Australian Open crowd during her match against local favourite Ash Barty on Tuesday.
Third seed Grigor Dimitrov suffered a huge scare against 186th-ranked qualifier Mackenzie McDonald before holding his nerve in a tension-charged finish to win 4-6, 6-2, 6-4, 0-6, 8-6 and reach the third round.
"Oh, so you're giving her the benefit of the doubt, but you're not giving it to me?" she asked British official Richard Haigh before dumping a volley into the net, then thrashing her racquet into the court in disgust after dropping serve.