I like Pettis to win by KO in round 4, I believe he has the ability to keep the fight standing and in his range outside of Poirer and his strong boxing ability. Poirier has never fought beyond 3 rounds and doesn't do to well when he steps up against elite competition. Pettis should also be able to keep the fight standing.
*This fight should be in the small octagon giving Poirier a shot, if they fight in the large octagon I would say Pettis is a lock.