UFC fights can end at any moment.

But no one was prepared for this.

And a gruesome injury ended this UFC fight in sickening fashion.

Conor McGregor is one of UFC’s biggest and most bankable stars.

Now his career is in doubt.

With just seconds remaining in the first round of his fight with Dustin Poirier at UFC 264, McGregor took a step back and his leg appeared to snap and bend in a direction it was not meant to bend.

The horrific injury ended the fight after the first round.

UFC President Dana White told the press McGregor broke his shin and would have surgery the next day.

This was the third fight in a trilogy between McGregor and Poirier figured to be one of the most bought UFC pay-per-views of the year.

McGregor won the first fight in 2016 while Poirier avenged that loss in January.

After the fight, McGregor believed the injury stole a victory from him.

“I was boxing the bleedin’ head off him, kicking the bleedin’ leg off him,” McGregor declared. “This is not over! If we have to take this outside for him, we’ll take it outside.”

Most observers believe Poirier was winning the fight at the time of the injury.

McGregor will now miss significant time recuperating from this injury and there are even questions about his career.

The former Lightweight Champion – McGregor gave up his title to box Floyd Mayweather – has now only won one of his last four fights.

McGregor will come back to fight again – he’s too big a star and a draw for UFC not to schedule more matches.

But it is an open question as to whether or not he can retain his drawing power without winning some fights.

Sports with Balls will keep you up-to-date on any new developments in this ongoing story.