Exactly. And, Federer was also winning 4 Wimbledons in the 4 consecutive years that he won 4 USOs. Winning the summer slams in 2004, 2005, 2006, and 2007 (and being one defeat short of also winning 4 AOs) is a domination not scene before or since.It is about dominance though. Here's a gambler's way of looking at this. Winning 4 or 5 in a row is rare because it requires consistency and a testament to being unbeatable.