Sergio Pettis joins 'Showtime' sibling with Matt Hobar fight at UFC 181

They call him "The Phenom" ... but he hasn't done anything phenomenal just yet.

That could all change for Sergio Pettis when he locks horns with fellow bantamweight Matt Hobar at the upcoming UFC 181 pay-per-view (PPV) mixed martial arts (MMA) event on Dec. 6, 2014 inside MGM Grand Garden Arena in Las Vegas, Nevada.

UFC announced the showdown over the weekend.

Pettis (11-1) -- younger brother of UFC lightweight champion Anthony Pettis -- is just 21 years old, but has already compiled a 2-1 record inside the Octagon, sandwiching a submission loss to Alex Caceres between unanimous decision victories over Will Campuzano and Yaotzin Meza.

A finish in "Sin City" would likely go a long way in helping him meet his lofty expectations.

Don't expect Hobar (9-2) to just roll over. "The Crowbar" was bent out of shape by Pedro Munhoz back in May, but rebounded with a unanimous decision win over Aaron Phillips just a few months later. Of his five finishes, just one has come by way of knockout/technical knockout.

Early predictions?

UFC 181 features a championship doubleheader in the main- and co-main events, with UFC Welterweight Champion Johny Hendricks making his first 170-pound title defense against the man he defeated to win it, Robbie Lawler, while the aforementioned "Showtime" does the same -- almost 18 months removed from capturing 155-pound gold -- against Gilbert Melendez.

To check out the latest UFC 181: "Hendricks vs. Lawler 2" fight card and rumors click here.