#1 Robbie Lawler vs Rory MacDonald - UFC 189 (July 11, 2015)

The finest fight in UFC history may never be bettered for thrilling back and forth action and unbridled brutality and drama.
Competing for Robbie Lawler's Welterweight Championship, he and Rory MacDonald contested the greatest MMA fight of all time.
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Lawler dominated the early rounds with his trademark punching power, finding his range at will as he steadily dismantled his challenger's face with ease until it more closely resembled something out of a horror movie.
It looked like the fight was a mere formality at that point, then somehow, MacDonald fired back in round three with a crushing head kick which knocked Lawler silly. MacDonald then unloaded with a series of vicious elbows and punches that nearly earned him the fight and busted Lawler open too.
The rest of the fight ebbed and flowed with stunning striking combinations as both men wore each other down before finally in the final round, Lawler punched MacDonald straight in the nose where an audible crunch could be heard as it broke. Finally, MacDonald was done and Lawler was victorious.
The massacre was over and the finest bout in the sport's history was in the books.