Watch fan get knocked out by rival supporter as crowd fight at heated Man Utd versus Arsenal ‘friendly’ in US

THINGS got heated last night during Arsenal and Manchester United's pre-season friendly in the US.

United got the better of Arsenal with a 2-0 victory thanks to goals from Bruno Fernandes and Jadon Sancho.

Bizarrely, there was also a post-game penalty shoot-out despite United's victory at the MetLife Stadium.

United also triumphed in that, with a 5-3 shootout victory.

Despite the fixture officially being a friendly - there was plenty of needle on and off the field.

United defender Lisandro Martinez caused a ruckus after wiping out Bukayo Saka with a reckless first half tackle.

The foul enraged Arsenal captain Martin Odegaard - with the two going at it as Saka was left on a heap on the floor.

Martinez received a yellow for his troubles, but it seems the bad temper on the pitch affected those in the crowd.

A video emerged shortly after the game of two fans fighting in the stands - although it is unclear which teams both men supported.

The video, which was shot from another stand showed a man in blue throwing a punch at a man wearing an Arsenal shirt.

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The two were then separated by bystanders, with the man in blue being dragged away from the scene.

The 2-0 loss to Manchester United was Arsenal's first defeat of pre-season after a 1-1 draw with Nurnberg and a 5-0 victory over an MLS All Star team managed by Wayne Rooney.

United meanwhile continued their winning ways having beaten Leeds and Lyon in previous outings.

United will play Ryan Reynolds and Rob McElhenney owned Wrexham on Wednesday with United confirming they will play a "" team against the League Two side.