That was after winning Wimbledon in July, with Djokovic now possessing 50 per-cent of the tour's Grand Slam titles.
Millman's upset win against Roger Federer, regarded by many as the best player of all time, in the fourth round of a grand slam was a career highlight for the proud Queenslander.
Djokovic then won the tie-break from 1-3 down to clinch a 95-minute set and, although Del Potro also threatened a comeback in the third, there was no doubt who was the stronger player.
Del Potro, a sentimental favorite after nearly retiring in 2015 due to four wrist surgeries, couldn't overcome Djokovic's steely baseline game. The Serbian had to endure a dramatic 20-minute service game in which his opponent had three more break points but could not take them.
Djokovic has appeared to be nearing top form in the second half of the year, and only Roger Federer (20) and Rafael Nadal (17) have won more majors than the 31-year-old.
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Some two hours after the match, del Potro walked out to the players garden to a greeting from his group of about a dozen friends who have led the cheers from his box, supporters from back home he has credited with keeping his spirits up during the depressing days when he was injured.
"Maybe 10 years ago I would say I'm not so happy to be part of this era with Nadal and Federer", he stated.
Osaka, whose next scheduled tournament is the Toray Pan Pacific Open later this month in Tokyo, said she was still too exhausted to celebrate her U.S. Open win.
Early in the tournament the extreme heat and humid conditions in NY were clearly troubling Djokovic.
For world number three Del Potro, it was a heartbreaking experience coming in just his second Slam final, nine years after he was crowned US Open champion before a long battle with wrist injuries pushed him into depression and to the brink of retirement.
The match was played with the roof closed at Arthur Ashe Stadium because of rain.
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"I feel like these guys, rivalries with these guys, matches with Federer and Nadal, have made me the player I am, have shaped me into the player I am".
Federer lost in the fourth round in NY, while Nadal retired from his semifinal against del Potro because of a bad right knee. Three times, Djokovic steeled himself. Barty and Vandeweghe kissed the trophy and won $700,000 for their championship.
Since the 2003 Wimbledon, the Big 3 have won 51 of 62 Grand Slams on the men's side.
It's del Potro's first major final since he won his only one in the 2009 U.S. Open by beating Roger Federer.
Djokovic continued a remarkable summer after missing the end of last season with a right elbow injury.
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Loewenthal said the area should prepare to see impacts, including rough surf and risky rip currents, as early as Sunday. As of 11 a.m., Florence had a maximum wind speed of 115 miles per hour , bringing it to major hurricane status.