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While Jannik Sinner took on Taylor Fritz at the US Open men’s final at Arthur Ashe Stadium, Taylor Swift and Travis Kelce were on hand to watch the action.

At Sunday’s event, Travis and Swift were seen dancing to The Darkness’s 2003 song “I Believe in a Thing Called Love.”

Aside from that, Kelce was largely tame.

A body language expert even stated that Travis Kelce’s behavior toward Taylor Swift suggested he was ‘becoming less interested.’

Travis seemed distracted at times, even watching something on his mobile phone as fans guessed he was keeping tabs on NFL action rather than watching Tennis.

Darren Stanton told Tyla that energy levels from Travis Kelce had ‘decreased.’

“The PDA from the pair was very full on for a while, holding hands and kissing in public, but this seems to have decreased as time has gone on. He’s only really trying when she’s looking.”

The NFL star showed up rocking a Gucci cardigan layered over a matching polo and shorts by the fashion house. He also accessorized with a coordinating Gucci bucket hat.

Swift was dressed in a Zimmermann Halliday Scallop Midi Dress.

Travis Kelce On Why His Behavior Was So Sub-Dued At The US Open With Taylor Swift

What was going on with Travis Kelce at the US Open?

The Kansas City Chiefs tight end and his pop star girlfriend took in some tennis as they enjoyed some precious free time together.

He was noticeably less loud and crazy than people have become used to seeing over the years, especially since he began dating Taylor Swift.

While speaking to his co-host and brother, Jason Kelce, he said: “It’s very quiet, and you know us… when it’s very quiet, we want to do something or say something.

“I’ve never been a quiet person, I’ve always been the kid at the back of the class when it gets quiet, saying something smart or funny, or trying to get a rise out of someone.

“The entire time I wanted to heckle the Italian guy Sinner, the No 1 player in the world, and really try and get into his head and help my guy Fritzy out, give him a home court advantage here in America, but I played it cool, I played it respectful, knowing that’s kind of frowned upon.

“I’m sure if I started heckling him like the guy in Happy Gilmore – ‘you stupid jacka**’ – I would have been asked to leave pretty quick.”