Part of the joy of his contests with Federer is watching the way he mercilessly tests the arc of the Federer backhand, those high, looping, teasing topspins forcing the Swiss to execute a stroke that looks almost vaudevillian.
Federer responded in Melbourne by stepping in and taking the backhand, where possible, on the up. But Nadal was not discouraged, switching the play, using the expanses of the court, testing Federer's legs, before shunting it back into the backhand side. The ebb and flow, thrust and counter-thrust, was magical.
For more on Matthew Syed's probing article please go to Craig Hickman's Blog. The entire article is HERE