. ♪ ♪ after parting ways with hall of fame corner man, emmanuel stewart, coto hired diaz last fall andadjusting to his new instructor. >> miguel, had some pressure coming from the trainer's side. he always says that he is a friend, outside of the gym. but he is a hard worker inside the gym to try to follow him if you want to train with him. >> he is a pretty loud guy. >> i don't really like that. but i have to work with him. it's his way to work. and i have to be with him for this part. >> diaz also brings an ak dem -- academic approach, befitting of a man who holds a doctor at and university sport in cuba. so workouts and location, vary each day, boxing drills integrated with conditioning work. every movement closely recorded and calibrated in a small notebook of dr. pedro diaz. >> he's like a computer. half is problem. he knows what road he want to take at the victory. >> for miguel coto, a fighter who changed trainers three times in three years, the experience so far with diaz, first the win over margarito and invigorating training camp has his realize that this can be a lasting one