Two punters come to blows at the Eminem concert in Melbourne, with one finding himself out for the count. Courtesy Youtube/Scoopie Doop

AN Eminem fan has been knocked out by a sickening blow from a fellow concertgoer during the rap superstar’s show in Melbourne this week.

Thousands of revellers flocked to Etihad Stadium to see Eminem — as well as Kenrick Lamar, 360, J Cole and Action Bronson — on his Rapture tour on Wednesday night.

But one fan will presumably remember little of the concert after he was punched to the ground in a tunnel behind the seats.

Video posted on YouTube shows the man pushing another man against a wall and holding his throat.

But when two security guards tried to intervene, the aggressor quickly became the victim, as he was felled with a violent punch to the head.

The offender stood over him and yelled as he writhed and twitched on the ground.

Security then struggled to restrain the agitated attacker.

tom.minear@news.com.au