Rafael Nadal, who just won the U.S. Open for the second time, is my hero. His athleticism is extraordinary. His focus is awe-inspiring. His skill is, clearly, second to none. His will is unremitting. It's a joy to watch him in competition. Yet those are not the reasons he's my hero. In fact, it wasn't until after he was finished playing in this year's final that he rose to role model in my book.