It was a back and forth affair for the lightweight title, Romero was fighting a good fight, landing power of his own and had his moments but the power of Davis proved too much, and like an RKO, this KO was out of nowhere.
Romero had been very defensive throughout the fight and had avoided most power punches of Davis but in round 6. Romero got aggressive and it was his downfall. As he rushed he he was caught with a counter hook that put him down. He did beat the ten count but was very wobbly and the referee has seen enough. And much like Chael Sonnen, Davis is still undefeated.