UFC Fight Night: Mendes vs. Lamas (also known as UFC Fight Night 63) was a mixed martial arts event held on April 4, 2015 at the Patriot Center in Fairfax, Virginia.

The event was the third that the organization has hosted at the venue and first since 2012. The preliminary portion of the card began at 11 a.m. ET / 8 a.m. PT, with the main card starting at 1:00 p.m. ET / 10:00 a.m. PT, a rare time slot for UFC events held in North America.

The event was headlined by a featherweight bout between former title challengers Chad Mendes and Ricardo Lamas.

Jorge Masvidal was briefly linked to a bout with Bobby Green at the event. However, shortly after the bout was announced by the UFC, Green pulled out of the bout citing a leg injury and was replaced by former WEC & UFC Lightweight champion Benson Henderson Subsequently, Henderson was removed from the bout with Masvidal as he was tabbed as a replacement for Stephen Thompson to face Brandon Thatch in the event headliner on February 14, 2015 at UFC Fight Night 60. On February 2, Al Iaquinta was announced as Masvidal's new opponent.

Clint Hester was expected to face Luke Barnatt at this event. However, Hester pulled out of the fight in early March due to a foot injury. Subsequently, Barnatt was pulled from the card entirely in favor of a matchup with Mark Muñoz in May at UFC Fight Night 66.

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