UFC on Fox: dos Santos vs. Miocic (also known as UFC on Fox 13) was a mixed martial arts event held at U.S. Airways Center in Phoenix, Arizona, on December 13, 2014.

The event was the first that the organization has hosted in Arizona. Zuffa previously hosted the final World Extreme Cagefighting event, WEC 53, in nearby Glendale in 2010.

The fight card was headlined by a heavyweight bout between Junior dos Santos and Stipe Miocic.

John Moraga was expected to face Jussier Formiga at the event. However, Formiga was forced to pull out of the fight due to injury and was replaced by UFC newcomer Willie Gates.

Nate Diaz missed weight on his first attempt at the weigh-ins, weighing in at 160.6 pounds. He was given additional time to make the lightweight limit, but made no attempt to cut further. Instead, he was fined 20 percent of his purse, which went to Rafael dos Anjos.

A middleweight bout between Ed Herman and Derek Brunson, slated for the televised preliminary portion of the event, was cancelled on the day of the event, as Brunson was stricken with a stomach ailment. The fight was rescheduled to take place the following month at UFC 183.

The following fighters were awarded $50,000 bonuses:

The following is the reported payout to the fighters as reported to the Arizona Boxing and MMA Commission. It does not include sponsor money and also does not include the UFC's traditional "fight night" bonuses.

^ Diaz was fined $4,000, 20 percent of his purse for failing to make the required weight for his fight with Rafael dos Anjos. That money was issued to Dos Anjos, officials confirmed.
< Bout did not take place as Brunson was unable to compete after becoming ill the day of the fight. Herman was paid his show money.

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