There’s been a healthy rivalry between Manchester United and Liverpool FC for over 100 years…but is that a good thing or a bad thing.

Think about some of the biggest sporting rivalries in history.There was Muhammad Ali going toe-to-toe with Joe Frazier in the boxing ring, Martina Navratilova facing off with Chris Evert on the tennis court and Nick Faldo going head to head with Greg Norman on the golf course. India and Pakistan still have a healthy cricket rivalry going on.Even the world of chess has seen its own classic rivalry with the many battles between Garry Kasparov and Anatoly Karpov over the years. (more…)