The new documentary about Bjorn Borg and John McEnroe reminds us of the strong parallels between Borg-McEnroe and the Roger Federer-Rafael Nadal rivalries.
McEnroe's prattle of the sexes -- haven't we heard this type of thing from him?
Neither has had it easy so far at Wimbledon, but they're still headed toward another showdown. Here's how Rafael Nadal can surpass Roger Federer as the best tennis player. Ever.