He knows it sounded weird, but Takashi Uchiyama said he's spent significant time in training since he took his first professional loss to Jezreel Corrales earlier this year.

Now it's time for the 37-year-old to capitalize on that valuable time in a rematch against the Panamanian on New Year's Eve at Ota City General Gymnasium.

"Since I lost to him, I've reflected on it, thinking of who I am and all that," Uchiyama said at a signing ceremony for their world-title fight at a Tokyo hotel on Thursday.