Sports Illustrated
Tiger Woods and Rory McIlroy have become good friends outside the ropes.
From the earliest days of competition, the thought has been that negative feelings toward an opponent would only help motivate a person to defeat them. Storied athletic rivalries are often accompanied by stories of bitter feelings and outright hostility (i.e. Ali-Frazier, Belicheck-Mangini, Brett Favre-Aaron Rogers) or even mutual respect can have some tense moments (Nicklaus-Palmer, Connors-McEnroe, etc.).