Defending champion Jannik Sinner’s consecutive-sets streak ended in the second round of the Australian Open on Thursday night, but he advanced with a 4-6, 6-4, 6-1, 6-3 victory over wild-card entry Tristan Schoolkate. The top-ranked Sinner entered the night having won 29 sets in a row dating to late last season and he dropped the opener against No. Schoolkate, an Australian.