Which factor is more important to impart heavy spin + acceleration, given that one swings at the same speed every time? Federer: Swingweight 338, Static weight 362g, Spins at ~3500 rpm Nadal: Swingweight 355, Static weight 332g, Spins at 4000+ rpm (Although it's been said that Nadal's backhand lacks the bite of his forehand.) Notice how their racquets are complete opposites. (One's heavier in one category, vice versa.) I suppose it depends on the path/style of one's swing? I'm unable to see which of the two has the quicker swing.