The "Mexican style" of fighting is simply take 3 shots to land 1, great cardio, good chin, wear down your opponent and finish strong. Julio Cesar Chavez who many people think is great (I think he's overrated) was notorious for that style. At lower weights against inferior competition it worked, but as he moved up in weight against "live" fighters, it didn't work so much.
When De La Hoya came along, he was the first Mexican fighter up on his toes, moving, ducking shots and using a good jab.
Was their another Mexican fighter who had defense prior to De La Hoya?