UFC on Fox: Johnson vs. Moraga was a mixed martial arts event held on July 27, 2013, at the Key Arena in Seattle, Washington. The event was broadcast live on FX and Fox.

Demetrious Khrisna Johnson is an American professional mixed martial artist. He currently competes in ONE Championship, where he is the current ONE Flyweight Champion. He is the inaugural and former UFC Flyweight Champion. Known for his quick striking and elusive movement, Johnson co-holds the record for the latest finish in UFC history with a submission win at 4:59 of the fifth round against Kyoji Horiguchi. Johnson also holds the record for most finishes in UFC flyweight history with 7. Johnson is widely regarded as one of the greatest MMA fighters of all time.