Top light heavyweight Gegard Mousasi and UFC veteran Jake O’Brien have verbally agreed to fight at DREAM 15 set for July 10th from the Saitama Super Arena in Saitama, Japan, according to MMAFighting. Mousasi is coming off the biggest loss of his career, losing his Strikeforce light heavyweight title to Muhammed “Mighty Mo” Lawal at Strikeforce “Nashville”