Former Grand Slam champion Andre Agassi has urged Australian tennis player Nick Kyrgios to find a coach for himself if he wants to fulfil his unquestionable potential.
The world number one faces Argentina's Leonardo Mayer in an afternoon match on Rod Laver Arena on what is forecast to be a hot Melbourne day.
"It's an important victory for me, I mean, he's a tough opponent".
"He's a great player". "After a while without being on the competition ... second victory in a row, that's very important".
But it will be a tougher task on Margaret Court Arena against Damir Dzumhur, the first seed he has faced in his comeback from a knee problem. The diminutive Argentine regrouped from losing the first set to win 6-7 (1), 6-2, 6-3, 6-3 in two hours and 38 minutes.
"That was insane", Wozniacki said after winning the last six games in a memorable 3-6, 6-2, 7-5 victory.
"She just played above and beyond", said the 37-year-old. "I was kind of lucky".
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In the end, she battled on to finish the match, but went down in straight sets.
In the night session, home boy and the 17th seeded Kyrgios takes on Serbia's Troicki in an interesting match-up.
Petra Martic celebrated her 27th birthday with a 6-3, 3-6, 7-5 win over Luksika Kumkhum to advance to the fourth round at Melbourne Park.
I needed hours of court, hours of practice, hours of playing sets with different players. The Serbian player walked, smiling, to the umpire's chair to apologize, while Keothavong joked: "It's not my day, is it?"
The 22-year-old later admitted he "felt heavy" on court.
Marta Kostyuk came from the other angle.
And the Bulgarian delivered in a testing 6-3, 4-6, 6-4, 6-4 win over Russian rising star Andrey Rublev as temperatures touched 40 Celsius (104 Fahrenheit).
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Before the match had even begun, Kyrgios was hit with a code violation for being too slow to start.
But she still has a lot to learn with fellow Ukrainian Svitolina handing out a 6-2, 6-2 lesson.
It sets her up with a clash against 19th-seeded Slovak Magdalena Rybarikova.
On the women's side, Jelena Ostapekno lost to Anett Kontaveit 6-3, 1-6, 6-3.
"I was very focused and I'm very happy to have another chance on Sunday", Nadal said.
He surged in the fourth set tiebreak to 5-2, but made four errors in the final five points to lose the match - recording his worst Open performance since 2007.
French Open victor Jelena Ostapenko struggled at times before beating Duan Yingying 6-3, 3-6, 6-4.
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