Ansel Elgort and Joe Jonas crank up the bromance at 2014 US Open... while lonely Leonardo DiCaprio struggles to stay awake

By Frances Kindon for MailOnline

All eyes were glued to the court for the nail-biting battle between tennis Titans Andy Murray and Novak Djokovic.

Except for Ansel Elgort and Joe Jonas, who shared a laugh in the VIP section.

While the rest of the crowd sat perched on the edge of their seats - apart from Leonardo DiCaprio who could barely keep his eyes open - the two US actors were more interested in goofing off together. 

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Bromance: Ansel Elgort and Joe Jonas still appeared to be in the honeymoon phase

Bromance: Ansel Elgort and Joe Jonas still appeared to be in the honeymoon phase

Lonely Leo: The actor sat apart from his mother and looked decidedly bored throughout the nail-biting match

Lonely Leo: The actor sat apart from his mother and looked decidedly bored throughout the nail-biting match

Leonardo attended the Men's Singles quarter final with his beloved mother Irmelin Indenbirken.

In an attempt to go incognito, the 39-year-old actor wore a peaked grey flat cap, pulled down low, whilst hiding his features behind his bushy beard.

But rather than joining in with the excitement, he cut a lonely figure, sitting off to one side, alternating between yawning, stroking his beard and puffing on an e-cigarette. 

When he wasn't puffing on an e-cigarette, a bored-looking Leo was stroking his beard
Is something keeping you up Leo?

Struggling to stay awake: Leo was clearly in need of a nap or two

Family day out: The 39-year-old attended the match with his mother Irmelin Indenbirken (right)

Family day out: The 39-year-old attended the match with his mother Irmelin Indenbirken (right)

There was also no sign of his current girlfriend Toni Garrn, who is believed to have moved into Leo's New York pad last March.

Meanwhile, it was laughs a-plenty for Ansel and Joe, who giggled like a pair of school girls throughout most of the match.

Clearly in high spirits, the bromantic duo happily posed for selfies with fans, before returning to their chuckle-fest. 

Belly laughs: Joe could barely contain himself as Ansel cracked the jokes while they enjoyed the match from the VIP section

Belly laughs: Joe could barely contain himself as Ansel cracked the jokes while they enjoyed the match from the VIP section

Smile! The twosome happily pulled silly faces for selfies with admiring fans as they ignored the action on the court
Smile! The twosome happily pulled silly faces for selfies with admiring fans as they ignored the action on the court

Smile! The twosome happily pulled silly faces for selfies with admiring fans as they ignored the action on the court

Agonising defeat: Andy Murray fought valiantly in his battle against Novak Djokovic

Agonising defeat: Andy Murray fought valiantly in his battle against Novak Djokovic

Also sitting courtside were Jeremy Piven and Bridget Moynahan, who similarly found something to laugh about.

The pair co-starred in 2001 movie Serendipity together, and have remained good friends since.

Perhaps Bridget could have chatted to lonely Leo, as they certainly have a few things in common. Bridget's ex, Tom Brady, with whom she has one child, is now married to Leo's ex girlfriend, Giselle Bundchen.

Good friends: Jeremy and Bridget laughed like old pals as they watched the match

Good friends: Jeremy and Bridget laughed like old pals as they watched the match

Something in common: Bridget and Leo's exes Giselle and Tom Brady are now happily married

A quick time out: As the tension mounted, Bridget took a short break to check her phone 

A quick time out: As the tension mounted, Bridget took a short break to check her phone 

That's all water under the bridge now though, with Bridget happily in a four-year relationship with Charlie's Angels director, Joseph McGinty Nichol.

It's a different story for her court date, Jeremy, who could well have been scanning the crowd for eligible ladies. He was last linked with Australian model, Sophie Turner, in April, but it now thought to be single.

Over in Kim Sears' corner things were far more serious, with the strain etched across her pretty features as she watched boyfriend Andy Murray's defeat. 

Bridget smiled shyly for the cameras while a confident Jeremy pulled his most handsome face

Bridget smiled shyly for the cameras while a confident Jeremy pulled his most handsome face

On the edge of her seat: Kim rooted for Andy every step of the way but couldn't contain her worry

On the edge of her seat: Kim rooted for Andy every step of the way but couldn't contain her worry

With her cascading honey blonde locks and model-like features, the 25-year-old artist sat willing her man on for the full three hours and 31 minutes of the game.

While she undoubtedly left the match with a heavy heart, the same couldn't be said for Ansel and Joe, who used the game's New York location as an excuse to hit the town. 

Dressed in ripped jeans and high-tops, Divergent star Ansel, 20, nailed the New York street style, while Joe opted for a more dapper look as they headed out in search of more fun. 

Boys' night: Joe and Ansel hit the town straight after the match

Boys' night: Joe and Ansel hit the town straight after the match

This way! Ansel seemed happy to follow Joe's suggestions about where to head next

This way! Ansel seemed happy to follow Joe's suggestions about where to head next

Joe dressed to impress in a trendy print shirt coupled with ankle grazer trousers

Joe dressed to impress in a trendy print shirt coupled with ankle grazer trousers

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