James McGee plays his first round match against Kazakhstan's Aleksandr Nedovyesov at the US Open later.
It's the first time the Castleknock club man has played in a Grand Slam tennis event.
The 27-year-old Dubliner qualified for the tournament proper after winning his three qualifying matches in New York, culminating in a final-round qualifier against China's Zhang Ze.
Here's McGee speaking to Sky Sports ahead of his big match
Novak Djokovic and Andy Murray also play later today while Maria Sharapova, Agnieszka Radwanska and Venus Williams are in action in the ladies singles later.
