Jannik Sinner advances at US Open, his first match since doping case ruling announced

​ Jannik Sinner said it “took some time to get in the rhythm,” but the world No. 1 in men’s tennis advanced to the second round of the US Open with a 2-6, 6-2, 6-1, 6-2 win against American Mackenzie McDonald. Read More Breaking News, Latest News and Videos | CNN