President Trump attended the US ​Open in Queens on Sunday to watch the men’s tennis finals — which had to be pushed back nearly 50 minutes so fans could get through the heightened security.

The president arrived at Arthur Ashe Stadium around 1:45 p.m., or 15 minutes before the highly anticipated showdown’s scheduled 2 p.m. start time, with a roar erupting from the crowd as he emerged from his suite to wave.

But then boos competed for woos when the Jumbotron cut to the president during the singing of the national anthem and between the event’s games.

Some tennis fans were furious at the entry delays caused by the security measures that came with the presidential visit, with throngs waiting in massive lines to enter the stadium.

Lines were so long that the stadium was still half-empty by the time the match was supposed to start — and Open organizers were forced to delay the event.

“As a result of the security measures in place, and to ensure that fans have additional time to get to their seats, we have pushed the start time,” the Open said in a statement.

The match between court stars Jannik Sinner and Carlos Alcaraz finally kicked off around 2:48 p.m. – 48 minutes behind schedule.

“These lines are outrageous,” said 27-year-old Dino Romeo, who traveled from California for the match and was forced to wait with everybody else through two metal detector screenings and hand searches before he could get inside.

Another attendee said, “I think [Trump’s visit] an inconvenience to the fans” — before her boyfriend cut in and said, “I think it’s great.”

Those reactions were emblematic of the crowd’s reaction to Trump.

“I don’t support him. I don’t think he’s qualified to be in there,” said a fan who booed the president. “I think he screwed everything up. I don’t think [Dem former Veep] Kamala [Harris] could have done a better job. We are just stuck.”

But another crowd-goer, a man named John, 36, said, “I love it — I think it’s great.

“It’s the US Open, and he’s the US president. I’m all about it.”

Trump brought along several members of his administration to watch the match, including US Attorney General Pam Bondi, White House Chief of Staff Susie Wiles, special presidential assistant Lindsey Halligan, Special Envoy to the Mideast Steve Witkoff and Treasury Secretary Scott Bessent.

He was also joined in the box by his son-in-law Jared Kushner and granddaughter Arabella, his longtime assistant Margo Martin and Rolex CEO Jean-Frederic Dufour.

The stands outside of the presidential suite were meanwhile filled with the usual line-up of US Open A-listers.

Actor Danny DeVito was met with uproarious cheers when the Jumbotron panned to him, while musicians Sting and Shaggy were also in attendance.

Outspoken Trump-critic Bruce Springsteen was among the fans watching the finals, too. The crowd went wild when the cameras cut to him and his hit “Dancing in the Dark” blared over the speakers.

Trump’s appearance at the Open stirred up controversy even before he set foot in the stadium, when the USTA advised broadcasters not to televise the crowd’s reaction to the president’s arrival.

“We ask all broadcasters to refrain from showcasing any disruptions or reactions in response to the President’s attendance in any capacity,” the USTA advised networks in a move that came after Trump was heavily booed at his last US Open appearance in 2015.

The USTA later said it “regularly” advises broadcasters not to televise “off-court disruptions.”

After Alcaraz’s win, Trump tossed MAGA hats to fans and stayed long enough to watch the awards ceremony.