Coco Gauff and Naomi Osaka can set up a blockbuster clash as the Australian Open enters the third round on Friday while Novak Djokovic steps up his quest for a record 25th Grand Slam title.Djokovic set another record in the second round when he played his 430th Slam contest to claim sole ownership of most singles matches played, men or women, in the Open Era ahead of Roger Federer (429) and Serena Williams (423).