Virtua Tennis 3 (First Impressions)

How do you improve a game as good as Virtua Tennis 2? Even though it's been four or five years since its release, it's still the best tennis game on any platform, anywhere. The sheer simplicity of the series masks an astonishing achievement: by pinning down the physics of a tennis ball and tying it together with simple, effective controls the game boils down to position and timing. Which means it's basically as open-ended as the real thing, and each game - heck, each point - is capable of unfolding into infinite possibilities. So exactly how do you build on 'one of the most enduringly playable games of all time' (as it's been referred to in some very highly respected quarters)?