UFC 185: Anthony Pettis vs. Rafael Dos Anjos

Rafael Dos Anjos, top, claimed an upset victory over Anthony Pettis on Saturday night as part of UFC 185 in Dallas.  (Ronald Martinez / Getty Images)

Rafael Dos Anjos, right, was a decided underdog going into his bout against Anthony Pettis but emerged Saturday night with the UFC lightweight belt.  (Brandon Wade / Associated Press)

Rafael Dos Anjos, top, has won nine of his last 10 bouts after defeating Anthony Pettis for the UFC lightweight title Saturday night in Dallas.  (Ronald Martinez / Getty Images)

Rafael Dos Anjos, top, dominated Anthony Pettis during their lightweight title bout Saturday in Dallas.  (Ronald Martinez / Getty Images)

Rafael Dos Anjos celebrates after beating Anthony Pettis by unanimous decision for the UFC lightweight title Saturday at American Airlines Center in Dallas.  (Ronald Martinez / Getty Images)

Rafael dos Anjos, right, is congratulated by his grandmother after defeating Anthony Pettis on Saturday night.  (Brandon Wade / Associated Press)

Rafael Dos Anjos celebrates after claiming the UFC lightweight belt from Anthony Pettis on Saturday night in Dallas.  (Ronald Martinez / Getty Images)

Joanna Jedrzejczyk, left, defeated Carla Esparza by technical knockout Saturday during UFC 185 in Dallas.  (Ronald Martinez / Getty Images)

Carla Esparza, right, lost her UFC strawweight title Saturday to Joanna Jedrzejczyk after a second-round TKO.  (Ronald Martinez / Getty Images)

Joanna Jedrzejczyk celebrates a TKO against Carla Esparza during UFC 185 in Dallas in March 2015.  (Ronald Martinez / Getty Images)

Johny Hendricks, left, defeated Matt Brown by unanimous decision Saturday at UFC 185 in Dallas.  (Brandon Wade / Associated Press)

Johny Hendricks lifts Matt Brown during UFC 185 Saturday in Dallas.  (Ronald Martinez / Getty Images)

Johny Hendricks, left, takes on Matt Brown during a welterweight bout Saturday in Dallas.  (Brandon Wade / Associated Press)

Alistair Overeem, right, defeated Roy Nelson by unanimous decision Saturday at UFC 185 in Dallas.  (Ronald Martinez / Getty Images)

Alistair Overeem, right, knees Roy Nelson in the stomach Saturday during UFC 185 in Dallas.  (Brandon Wade / Associated Press)

Roy Nelson, left, takes a knee to the chin from Alistair Overeem during UFC 185 in Dallas.  (Brandon Wade / Associated Press)

Henry Cejudo, top, forces Chris Cariaso to the mat Saturday during their UFC 185 bout in Dallas.  (Brandon Wade / Associated Press)

Henry Cejudo, right, defeated Chris Cariaso by unanimous decision Saturday during UFC 185 in Dallas.  (Ronald Martinez / Getty Images)

Ross Pearson delivers a blow to Sam Stout during their UFC 185 bout Saturday in Dallas.  (Brandon Wade / Associated Press)

Ross Pearson celebrates a TKO win in two rounds against Sam Stout during UFC 185 Saturday in Dallas.  (Brandon Wade / Associated Press)

Ross Pearson, right, defeated Sam Stout by technical knockout Saturday during their UFC 185 bout in Dallas.  (Brandon Wade / Associated Press)

Ross Pearson beat Sam Stout by technical knockout Saturday during UFC 185 in Dallas.  (Ronald Martinez / Getty Images)

Elias Theodorou, top, lands repeated blows on Roger Narvaez during their UFC 185 match Saturday in Dallas.  (Brandon Wade / Associated Press)

Beneil Dariush, left, and Daron Cruickshank fight Saturday during UFC 185 in Dallas.  (Brandon Wade / Associated Press)

Beneil Dariush, top, defeated Daron Cruickshank by submission Saturday during UFC 185 in Dallas.  (Brandon Wade / Associated Press)

Jared Rosholt, top, lands a punch on Josh Copeland during UFC 185 Saturday in Dallas.  (Brandon Wade / Associated Press)

Jared Rosholt, left, defeated Josh Copeland by technical knockout Saturday during UFC 185 in Dallas.  (Brandon Wade / Associated Press)

Ryan Benoit, left, defeated Sergio Pettis by technical knockout Saturday during UFC 185 in Dallas.  (Brandon Wade / Associated Press)

Germaine de Randamie, right, beat Larissa Pacheco by technical knockout Saturday during UFC 185 in Dallas.  (Brandon Wade / Associated Press)

Joseph Duffy, left, marked his UFC debut Saturday in Dallas with a first-round technical knockout of Jake Lindsey.  (Brandon Wade / Associated Press)