Defending champion Jannik Sinner beat 46th-ranked Marcos Giron of the U.S. 6-3, 6-4, 6-2 at the Australian Open on Saturday night, reaching the fourth round at Melbourne Park for the fourth time. Sinner stretched his unbeaten run to 17 matches, dating to last season. The 23-year-old Italian's next opponent in Australia will be either No. 13 Holger Rune or Miomir Kecmanovic.