EA SPORTS UFC 3

There is a glitch in ultimate team to make the game think every fight is knockout mode.

This can allow you to win fights in under 30 seconds for your win XP. This obviously being much quicker for grinding out the monstrous amount of XP needed for level 150 than actually playing 15 minute bouts.

First, load up ultimate team
Click solo challenges on the far left
Click lightweight
Click challenge #1 out of the list of 10
Load it up
As soon as you have control of your character, quit out
Then, play as many single player championships as you like

The solo fights will be glitched in knockout mode. You’ll have to knockout the AI in two of the rounds to win the fight to earn your 20 XP. The glitch will stay active as long as your Xbox is on and you won’t have to repeat the steps to activate. Just keep grinding those quick fights. I’d recommend doing 50-100 fights in a session to speed up progress.