Originally Posted by OrangePower
You are quite right. I think the person that posted that misunderstood the stat he/she was quoting.
I haven't done the probabilities math myself, but I believe the stat is that if you are evenly matched with your opponent such that on every and any point there is a 50% chance of either player winning the point, then there is a 2% chance of the set ending up 6-0.
If each player has an equal chance of winning a given game, there is a 1.56% chance of one player winning 6-0. But such stats ignore the ebb and flow of a match and assume every game really is a coin flip which we all know isn't the case through and entire set.