By MATT BOONE
MMANEWS.COM Staff Writer

Gegard Mousasi vs. Jake O'Brien is back on for tonight's DREAM 15 event, which airs live on HDNet beginning at 3:00 a.m. ET.

Mousasi-O'Brien will likely still be an opening round match of the light heavyweight grand prix, opposite Melvin Manhoef vs. Tatsuya Mizuno, despite O'Brien reportedly failing to make the 205-pound weight limit at any point today. According to reports, O'Brien only made it as low as 226 pounds as his lowest recorded unofficial weigh-in.

As covered in-depth earlier today, former UFC heavyweight champion Ricco Rodriguez was waiting in the wings to possibly take the fight with Mousasi, as he was already in Japan for a fight he thought he had lined up with current Strikeforce heavyweight champion Alistair Overeem. That fight fell apart and Rodriguez was stuck in Japan hoping for DREAM to find him an opponent so he could still compete on the show.