The event was expected to be headlined by a 145 lbs UFC Featherweight Championship bout between current champion José Aldo and top contender Conor McGregor. Aldo pulled out of the bout and a interim championship bout between Chad Mendes and McGregor took place at this event. The UFC received official medical confirmation from several doctors that Aldo did not have a broken rib as he claimed and the biggest problem was the weight cutting process being complicated by the injury. This was confirmed when a release of an Xray tied to an old injury was released by Aldo's camp. The co-main event featured a 170 lbs UFC Welterweight Championship bout between current champion Robbie Lawler and top contender Rory MacDonald. 145 lbs: Dennis Bermudez vs. Jeremy Stephens | 170 lbs: Gunnar Nelson vs. Brandon Thatch | 135 lbs.: Thomas Almeida vs. Brad Pickett
Conor McGregor
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Chad Mendes
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Robbie Lawler
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Rory MacDonald
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Jeremy Stephens
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Dennis Bermudez
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Gunnar Nelson
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Brandon Thatch
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Thomas Almeida
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Brad Pickett
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Matt Brown
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Tim Means
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Alex Garcia
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Mike Swick
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John Howard
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Cathal Pendred
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Cody Garbrandt
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Henry Briones
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Louis Smolka
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Neil Seery
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Cody Pfister
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Yosdenis Cedeno
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