World number one and defending champion Jannik Sinner roared back to surge into the Australian Open third round on Thursday as Iga Swiatek set up a showdown with Emma Raducanu.

Taylor Fritz was an emphatic winner in his pursuit of a maiden major title but exciting 18-year-old Joao Fonseca was edged out in a five-set thriller.

Daniil Medvedev, beaten in the Melbourne final last year by Sinner, faces Learner Tien, 19, of the United States in a later match.

Sinner dropped a set for the first time in 14 matches when he lost the opener to Australian wildcard Tristan Schoolkate.

But he wrested back control after a slow start to go through 4-6, 6-4, 6-1, 6-3 against the world number 173 at a cool and breezy Rod Laver Arena.

It was Sinner's 16th consecutive victory in an ominous sign for next opponent Marcos Giron.

"It's always tough to play against someone I don't know very well. He was playing much better than I was at the beginning," said the Italian, 23, who also won........

© International Business Times