Nate Diaz vs. Gray Maynard rematch now set to headline TUF 18 live finale on Nov. 30 in Las Vegas

Ultimate Fighting Championship (UFC) has been forced to shuffle a pair of its upcoming mixed martial arts (MMA) fight cards, thanks to an untimely injury to UFC on FOX 9 headliner Anthony Pettis, who just can't seem to get his knees to cooperate (again).

See how that mess unfolded right here.

To help fill the void on next month's network television offering, the 125-pound title fight featuring Demetrious Johnson vs. Joseph Benavidez has been borrowed from The Ultimate Fighter (TUF) 18 headliner and inserted into the Sacramento, Calif., main event on Dec. 14, 2013.

Band-Aid!

And with just two weeks left until TUF 18 live finale, the promotion had no choice but to back-fill its Nov. 30 headliner with the existing lightweight co-main event of Nate Diaz vs. Gray Maynard, a rematch slated for the Mandalay Bay Events Center in Las Vegas, Nevada.

Good thing Diaz is blowing off that high school reunion.

Because both combatants have been training for a three-round fight, it will remain that way despite taking over as the FOX Sports 1 main event. Maynard holds a split decision win over Diaz from the last time they went to war, a UFC Fight Night 20 headliner on Spike TV back in early 2010.

Once more, with feeling.

To see how the latest switcheroo has affected both fight cards, check out the latest UFC on FOX 9 roster here. TUF 18 fight card -- still pending until the completion of the combat sports reality show -- can be ogled here.

Lots of changes these past few days ... U mad?