|US Open 2019|
|Venue: Flushing Meadows, New York Dates: 26 Aug – 8 Sep|
|Coverage: Live text and BBC Radio 5 Live Sports Extra commentary on selected matches on the BBC Sport website and app. Click here for Live Guide.|
Nadal’s physical state is always a concern but the Spaniard looked sharp in a 6-3 6-2 6-2 victory.
The second seed broke Millman’s serve five times in a one-sided match.
Nadal, 33, will play Millman’s fellow Australian Thanasi Kokkinakis in the second round.
Kokkinakis, 23, has seen his career disrupted by a serious shoulder injury and will face the 18-time Grand Slam champion after earning his first win at a Grand Slam since the 2015 French Open.
Nadal is no stranger to injuries himself, of course, and his comfortable win against Millman was a happy return to Ashe, where he was forced to retire from his semi-final against Juan Martin del Potro with a knee problem last year.
Returning to deafening cheers for Tuesday’s night session, Nadal made a customary slow start as he fought off a break point in the first game before taking 30-year-old Millman’s serve in the fourth proved enough for the opener.
Millman, ranked 60th, earned the biggest win of his career against Federer in last year’s last-16 match after fighting back from a set down.
But he was unable to produce a similar fightback with Nadal focused and firing on the other side of the net to clinch victory in two hours and 11 minutes