Clay is definitely a factor, mind you - aren't Justine's only two wins against Serena and one win against Venus all on the dirty stuff? Still, one shouldn't try and detract from her performance, it's a remarkable feat. I always feel that she has more success against the Williamses and Capriati than Clijsters because she's a smarter tactical player; however, Kim has the definite mental edge which is why she is the clear no. 1 Belgian.
Say it Quietly, I'm White but I'm Really Rather Contrite