UFC flyweight champion Brandon Moreno sat on a mat and stretched his legs while the music of Argentine pop trio La K'onga blasted from the ceiling speakers.Moreno was working on the U.S. holiday as part of the final stages of preparation for his upcoming title defence, and the small, private facility on the outskirts of the Las Vegas Strip was filled with hints of his Mexican culture. A big image of Moreno, the U.F.C.'s first Mexican-born champion, hangs on the wall above the training area, showing him grinning while wearing the title belt and his country's flag over his shoulders.