Mercado (19-0, 18 KOs) has spent the last four weeks in Big Bear with his father and longtime trainer Ernest Mercado Sr., with boxing legend Mosley serving as a training advisor. TRAINING VIDEO: https://youtu.be/PSCQvt-cj44“The altitude has been great,” Mercado said. “It’s a different type of training and breathing, it really challenges your mental state. “After Sugar Shane invited us to train at his gym it was a no-brainer to have a fellow Pomona legend like Shane part of our camp,” Mercado Sr. said. I’m really seeing that in this camp and as he continues to grow as a fighter.