I've always thought that Sampras was/is a class act. But picking Fed at the 2009 USO (or not picking Fed) had nothing to do with it.
I guess it means Sampra didn't think all that highly of DelPo's game, which I would argue has little to do with being a "class act."
The weak never apologize, because they perceive it as a sign of weakness. The strong easily apologize because it is a sign of their strength.