FOTOS: McGregor noquea a Chad Mendes
Conor McGregor, left, takes a swing at Chad Mendes during their interim featherweight title mixed martial arts bout at UFC 189 Saturday, July 11, 2015, in Las Vegas. (AP Photo/John Locher) (John Locher / AP)
Chad Mendes, left, and Conor McGregor grapple during their interim featherweight title mixed martial arts bout at UFC 189 Saturday, July 11, 2015, in Las Vegas. (AP Photo/John Locher) (John Locher / AP)
Conor McGregor, left, punches Chad Mendes during their interim featherweight title mixed martial arts bout at UFC 189 Saturday, July 11, 2015, in Las Vegas. (AP Photo/John Locher) (John Locher / AP)
Chad Mendes, right, punches Conor McGregor during their interim featherweight title mixed martial arts bout at UFC 189 Saturday, July 11, 2015, in Las Vegas. (AP Photo/John Locher) (John Locher / AP)
EDS NOTE GRAPHIC CONTENT - Conor McGregor, left, hits Chad Mendes during their interim featherweight title mixed martial arts bout at UFC 189 Saturday, July 11, 2015, in Las Vegas. (AP Photo/John Locher) (John Locher / AP)
Jeremy Stephens, left, fights Dennis Bermudez during their mixed martial arts bout at UFC 189 on Saturday, July 11, 2015, in Las Vegas. (AP Photo/John Locher) (John Locher / AP)
Conor McGregor kneels on the mat after defeating Chad Mendes during their interim featherweight title mixed martial arts bout at UFC 189 on Saturday, July 11, 2015, in Las Vegas. (AP Photo/John Locher) (John Locher / AP)
Jeremy Stephens, left, fights Dennis Bermudez during their mixed martial arts bout at UFC 189 on Saturday, July 11, 2015, in Las Vegas. (AP Photo/John Locher) (John Locher / AP)
Jeremy Stephens fights Dennis Bermudez during their mixed martial arts bout at UFC 189 on Saturday, July 11, 2015, in Las Vegas. (AP Photo/John Locher) (John Locher / AP)
Jeremy Stephens, bottom, fights Dennis Bermudez during their mixed martial arts bout at UFC 189 on Saturday, July 11, 2015, in Las Vegas. (AP Photo/John Locher) (John Locher / AP)
Robbie Lawler celebrates after defeating Rory MacDonald in their welterweight title mixed martial arts bout at UFC 189 on Saturday, July 11, 2015, in Las Vegas. (AP Photo/John Locher) (John Locher / AP)
Robbie Lawler , left, lands a left hit to Rory MacDonald to end their welterweight title mixed martial arts bout at UFC 189 on Saturday, July 11, 2015, in Las Vegas. (AP Photo/John Locher) (John Locher / AP)
Blood drips from Rory MacDonald during his welterweight title bout against Robbie Lawler at the UFC 189 mixed martial arts event, Saturday, July 11, 2015, in Las Vegas. (AP Photo/John Locher) (John Locher / AP)
Conor McGregor celebrates after defeating Chad Mendes during their interim featherweight title mixed martial arts bout at UFC 189 on Saturday, July 11, 2015, in Las Vegas. (AP Photo/John Locher) (John Locher / AP)
Conor McGregor kneels on the mat after defeating Chad Mendes during their interim featherweight title mixed martial arts bout at UFC 189 on Saturday, July 11, 2015, in Las Vegas. (AP Photo/John Locher) (John Locher / AP)
Chad Mendes elbows Conor McGregor during their interim featherweight title mixed martial arts bout at UFC 189 on Saturday, July 11, 2015, in Las Vegas. (AP Photo/John Locher) (John Locher / AP)
Conor McGregor gets a kiss for his mom Margaret after defeating Chad Mendes during their interim featherweight title mixed martial arts bout at UFC 189 Saturday, July 11, 2015, in Las Vegas. (AP Photo/John Locher) (John Locher / AP)
Conor McGregor celebrates after defeating Chad Mendes in their interim featherweight title mixed martial arts bout at UFC 189 Saturday, July 11, 2015, in Las Vegas. (AP Photo/John Locher) (John Locher / AP)
Rory MacDonald, left, and Robbie Lawler exchange blows in their welterweight title mixed martial arts bout at UFC 189 on Saturday, July 11, 2015, in Las Vegas. (AP Photo/John Locher) (John Locher / AP)