Froch became a better fighter after the Kessler loss. Started boxing rather than trying to clean KO everyone he faced. led to schooling of AA, Clear win over Johnson and KO of Mack and Bute
salido learnt in the pro ranks - didnt have amateur career miguel vasquez, hopkins lost his first fight maidana under garcia
Winky Wright turned his style around for the better after he lost to Julio Cesar Vazquez, Manny Pacquaio also improved a lot since his younger years when he was basically a very raw one handed fighter. Martinez is also a guy that improved leaps and bounds since his early days where due to him being a late starter with almost no amateur fights in his ledger he had to learn on the job, if you watch him getting beat by Margarito and watch the fighter that later went on to go to war and stop Williams and win the middleweight title its like hes a different fighter all together from those early years.
Floyd: he went from willing to die in the ring to my health come first...his duck ability improved a lot.
Pacquiao from the Diaz fight onwards. Used the right as well as the left, moved better, didn't dive in recklessly and looked more balanced when throwing combinations. George Foreman at his comeback. Improved fundamentals, much more patient and savvy. Hatton's performance against Malignaggi was so good I gave him a chance against Pacquiao. Where did all that skill go? Barrera went from a classic Mexican body punching pressure fighter to a more versatile counter puncher.
Not sure if he's improved that much, take the fight against Collozo out, in his first 2 fights under Hunter the defensive frailties was still there and he seemed to have lost some of his attacking edge a bit. :conf Maybe we should just take his word for it that making 140 was a real struggle for him judging by his improvements last weekend.