10 UFC Fights That Did Not Go To Plan

10. B.J. Penn Overcomes Matt Hughes (UFC 46)

Back in 2004, Matt Hughes was the undisputed king of the Welterweights.

He won the UFC Welterweight title from Carlos Newton at UFC 34 and went on to defend the belt five times in a row - which was a record at the time.

BJ Penn on the other hand was a fighter who had not been seen in the UFC since drawing with Caol Uno at UFC 41 in their Lightweight title clash.

So, Hughes was fully expected to run straight through a contender who wasn't even fighting in his usual weight class when the pair eventually met at UFC 46.

When the fight got underway, however, fans started to sense that things weren't exactly going to plan when Penn managed to get Hughes on his back early in the fight. Penn was the constant aggressor here and Hughes was desperately trying to find a way to wriggle out of the Brazilian Jiu-Jitsu master's grasps.

Then, with less than a minute to go in the first round, Penn capitalised on a mistake from Hughes and locked in a rear-naked choke. The Champ was forced to tap out and we incredibly had ourselves a new Welterweight king.

Penn was later stripped due to a breach of contract. However, 'The Prodigy' was never supposed to knock off Hughes in the first place and this insane finish still ranks as one of the biggest upsets in the company's history.