Daniel Alfonso Castillo is an American mixed martial artist. A professional MMA competitor since 2007, Castillo has made a name for himself fighting in California. He currently fights at lightweight in the Ultimate Fighting Championship. He fights out of Sacramento, California and trains with Urijah Faber at Ultimate Fitness. In May 2013, Danny opened P2O Hot Pilates & Fitness in Sacramento, CA.
- Born: August 25, 1979 (age 37)
- Height: 5′ 9″ (1.75m)