The experience and consistency of No.4 seed Elina Svitolina have proved far too much for the precocious talent of teen sensation Marta Kostyuk in an all-Ukrainian third-round encounter at the Australian Open.

Svitolina – the only seeded player remaining in her quarter of the draw – won 6-2 6-2 on another searing hot day in Melbourne.

Her next opponent will be Czech qualifier Denisa Allertova, who moved into the last 16 at a major for the first time with a commanding 6-1 6-4 win over Poland’s Magda Linette.

Pre-tournament title favourite Svitolina won Brisbane two weeks ago and is among five women in contention to replace Simona Halep as world No.1, depending on results at Melbourne Park.

She needed only 59 minutes to end the campaign of 2017 Australian Open junior champion Kostyuk, who committed 31 unforced errors, compared with only 11 from the racquet of Svitolina.

“It is very special for me,” said the 23-year-old Svitolina, after reaching the last 16 at the Australian Open for the first time.

“It’s sad that it was against a Ukrainian girl. That’s always tough.

“(Kostyuk) always fights until the end.

“She has a very bright future and you’re definitely going to hear a lot more about her.”

In other early action on Friday, Petra Martic overcame the aggressive approach of Thai qualifier Luksika Kumkhum to move into the fourth round.

Kumkhum dominated the winners’ count 44-16 but the the steadiness of Martic proved crucial as the unseeded Croatian advanced 6-3 3-6 7-5 in a match lasting two hours and 10 minutes.

It was a double celebration for Martic, who turned 27 on Friday.

“It was very tough today,” she said.

“Two days ago I was already struggling so I was mentally better prepared for these conditions.

“But today was really just try your best and survive until the end.”

Martic will play either Frenchwoman Alize Cornet or Belgian Elise Mertens in the fourth round on Sunday.