UFC 168 Photos Anderson Silva gets ready for his fight during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Chris Weidman makes his way to the Octagon during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Chris Weidman gets checked out before his fight during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Chris Weidman waits while Anderson Silva is introduced during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Bruce Buffer introduces Chris Weidman during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Anderson Silva gets ready for his fight during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Chris Weidman tries to finish Anderson Silva early during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Chris Weidman tries to finish Anderson Silva during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Chris Weidman tries to finish Anderson Silva during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Chris Weidman punches Anderson Silva again during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Anderson Silva makes it out of the first round during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Chris Weidman elbows Anderson Silva during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Chris Weidman battles Anderson Silva during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Chris Weidman checks Anderson Silva's kick during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Anderson Silva's leg shatters during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Anderson Silva holds his broken leg during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Anderson Silva grimaces in pain during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Chris Weidman checks on Anderson Silva during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Chris Weidman celebrates his win in front of an injured Anderson Silva during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Chris Weidman retains his middleweight belt during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Anderson Silva is taken to the hospital during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Chris Weidman poses with his team during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Chris Weidman is interviewed after the win during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Miesha Tate gets ready for her fight during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Ronda Rousey steps into the cage during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Ronda Rousey punches Miesha Tate in the face during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Ronda Rousey puts Miesha Tate on the cage during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Ronda Rousey elbows Miesha Tate in the head during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Miesha Tate rocks Ronda Rousey during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Ronda Rousey punches Miesha Tate during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Ronda Rousey punches Miesha Tate during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Ronda Rousey punches Miesha Tate during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Ronda Rousey punches Miesha Tate during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Miesha Tate battles Ronda Rousey on the ground during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Ronda Rousey tries to submit Miesha Tate during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Ronda Rousey tries to submit Miesha Tate during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Ronda Rousey tries to finish Miesha Tate during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Ronda Rousey punches Miesha Tate in the face during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Ronda Rousey battles Miesha Tate during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Ronda Rousey hits Miesha Tate in the body during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Ronda Rousey gets ready for the third round during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Ronda Rousey drills Miesha Tate during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Ronda Rousey goes for the armbar again during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Ronda Rousey tries to submit Miesha Tate during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Ronda Rousey locks up the armbar against Miesha Tate during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Miesha Tate is left hanging by Ronda Rousey during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Ronda Rousey celebrates her win with Gene LeBell during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Miesha Tate watches Ronda Rousey celebrate again during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Ronda Rousey gets the belt again during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Ronda Rousey talks to Joe Rogan during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Travis Browne circles the cage during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Josh Barnett gets ready for his fight during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Josh Barnett gets ready to engage Travis Browne during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Travis Browne punches Josh Barnett during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Travis Browne finishes Josh Barnett during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Travis Browne elbows Josh Barnett during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Travis Browne gets the knockout win during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Travis Browne celebrates his win during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Travis Browne celebrates his win during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Travis Browne celebrates his win during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Josh Barnett gets checked on by doctors during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Travis Browne celebrates with his team during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Jim Miller gets ready to engage during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Jim Miller punches Fabricio Camoes during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Jim Miller kicks Fabricio Camoes in the groin area during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Jim Miller battles Fabricio Camoes during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Jim Miller submits Fabricio Camoes during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Jim Miller gets the win during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Jim Miller poses with his team during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Diego Brandao gets his game face on during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Dustin Poirier takes a kick from Diego Brandao during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Dustin Poirier kicks Diego Brandao during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Diego Brandao kicks Dustin Poirier during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Diego Brandao and Dustin Poirier exchange shots during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Dustin Poirier rocks Diego Brandao during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Diego Brandao and Dustin Poirier hug it out during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Dustin Poirier gets the win during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Uriah Hall punches Chris Leben during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Uriah Hall drills Chris Leben with a kick during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Chris Leben gets knocked down during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Uriah Hall hits Chris Leben with a knee during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Uriah Hall hits Chris Leben with an elbow during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Uriah Hall punches Chris Leben during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Uriah Hall knocks Chris Leben down during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Uriah Hall tries to finish Chris Leben during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Uriah Hall tries to finish Chris Leben during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Uriah Hall leaves Chris Leben after bell sounds during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Chris Leben suffers the loss after not returning for the second round during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Chris Leben walks back to the locker room during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Michael Johnson strikes Gleison Tibau during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Michael Johnson rocks Gleison Tibau during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Michael Johnson hits Gleison Tibau while he goes down during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Michael Johnson looks to finish Gleison Tibau during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Michael Johnson gets the win during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Michael Johnson earns the KO win during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Manny Gamburyan battles Dennis Siver during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Dennis Siver delivers a low kick to Manny Gamburyan during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Dennis Siver looks for the finish against Manny Gamburyan during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Dennis Siver tries to submit Manny Gamburyan during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Dennis Siver gets the unanimous decision win during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Siyar Bahadurzada and John Howard exchange shots during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos John Howard picks up Siyar Bahadurzada during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos John Howard punches Siyar Bahadurzada during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Siyar Bahadurzada kicks John Howard during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Siyar Bahadurzada knees John Howard during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos John Howard tries to finish Siyar Bahadurzada during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos John Howard gets the unanimous decision win during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos William Macario makes his way to the Octagon during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Bobby Voelker gets ready for his fight during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos William Macario knees Bobby Voelker during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos William Macario punches Bobby Voelker during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Bobby Voelker strikes William Macario during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos William Macario strikes Bobby Voelker during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Bobby Voelker and William Macario exchange shots during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos William Macario knees Bobby Voelker during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Bobby Voelker is pouring blood from his nose during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 photos William Macario hits Bobby Voelker with an elbow during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos William Macario hits Bobby Voelker during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Bobby Voelker is covered in his own blood during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos William Macario wins via unanimous decision during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 photos Robbie Peralta gets ready for his fight during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Robbie Peralta elbows Estevan Payan during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Estevan Payan battles Robbie Peralta on the ground during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Robbie Peralta drills Estevan Payan during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Robbie Peralta smacks Estevan Payan during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.

UFC 168 Photos Robbie Peralta celebrates his third-round KO during UFC 168 at the MGM Grand in Las Vegas, Nev. on Dec. 28, 2013.