Efficient Sinner eases into US Open third round

[Nickie]

Defending champion Jannik Sinner beats world number 36 Alexei Popyrin in straight sets to secure a safe passage through to the US Open third round.

More... (https://www.bbc.com/sport/tennis/articles/c890jk0v7xzo?at_medium=RSS&at_campaign=rss)