Report: UFC champ Conor McGregor withdraws from Vin Diesel's new XXX movie

Limitations? That word doesn't exist when all you know how to do is win.

But the bitter taste of defeat has a way of establishing priorities, and if reigning Ultimate Fighting Championship (UFC) featherweight champion Conor McGregor is going to reach this lofty goal, then he's going to have to jettison some of that extra cargo.

Starting with his planned trip to Tinseltown.

As I mentioned on @SportsCenter, I'm told McGregor has canceled his planned appearance in Vin Diesel's XXX film. Doesn't want distraction.

— Brett Okamoto (@bokamotoESPN) March 19, 2016

Like Ronda Rousey before him, "Mystic Mac" began racking up countless endorsement deals, along with high-profile opportunities outside the world of mixed martial arts (MMA). And, also like "Rowdy," it all came crashing down in one fell swoop.

Now it's time to see if it was merely a temporary setback, or the beginning of the end.

We'll likely find out here.