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The event was the third that the organization has hosted in Dublin, following UFC 93 in January 2009 and UFC Fight Night: McGregor vs. Brandao in July 2014. The event was expected to be headlined by a lightweight bout between Dustin Poirier and Joseph Duffy. However, Duffy was forced to pull out of the fight on October 21, three days prior to the event, after sustaining a concussion during a sparring session earlier that week and the fight was scrapped. A flyweight bout between Paddy Holohan and Louis Smolka was promoted to serve as the event's new headliner. It was the first three-rounds main event bout since UFC 161 in June of 2013.
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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
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UFC 188: Velasquez vs. Werdum is an upcoming mixed martial arts event that will be held on June 13, 2015 at Arena Ciudad de México in Mexico City, Mexico. Champ Cain Velasquez vs. Fabricio Werdum | Eddie Alvarez vs. Gilbert Melendez | Kelvin Gastelum vs. Nate Marquardt | Yair Rodriguez vs. Charles Rosa | Angela Hill vs. Tecia Torres
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UFC Fight Night: McGregor vs. Siver was a mixed martial arts event held on Sunday, January 18, 2015 at the TD Garden in Boston, Massachusetts
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UFC Fight Night: Nelson vs. Story (also known as UFC Fight Night 53) was a mixed martial arts event held on October 4, 2014 at Ericsson Globe Arena in Stockholm, Sweden.
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UFC Fight Night: McGregor vs. Brandao (also known as UFC Fight Night 46) was a mixed martial arts event held on July 19, 2014 at The O2 in Dublin, Ireland.
