amazing match from Stan the man, although had the first TB had gone to Bandy it might have gone differently
Bandy fell apart in the second
He didn't actually fall apart... it's just that Wawa played one of his
matches as he does occasionally - he was painting lines consistently with great pace and very little mistakes off of BOTH wings. You can't do much against that, but noone can do it ALL the time, day in, day out.
And, sorry to say, but your title gets it all wrong - he didn't show Roger HOW to do it, because Roger will never beat David THAT way. Wawrinka has that amazing 1H backhand that is rock-solid if he is in form, it's the shot that can't be broken down by constant pummelling, like Fed's can be (utilized by both Nadal and Nalbandian).
Hats of to Stan the man, David doesn't have much to regret, it's not that he choked the match away. Stan just couldn't miss a deep shot and was serving like a monster.
Did anyone notice how Wawrinka stands further back when receiving 2nd serves, than when receiving 1st ones? It actually makes sense for his playing style, amazingly enough.