Mikulak, a two-time NCAA all-around champion, posted a score of 91.500. Jake Dalton is second, nearly three points behind. Alex Naddour is third followed by Joshua Dixon and Steven Legendre.
Danell Leyva, the bronze medalist in the all-around at the 2012 London Olympics, struggled all night and slipped to sixth. Defending national champion John Orozco is eighth in his first competition back from major surgery on his left knee.
Leyva and Orozco were the unquestioned leaders of the U.S. Olympic team last summer, but Mikulak, who just finished his junior year at Michigan, has surpassed them both.