BTW - I disagree with the notion that Waw will just fold. This is a QF and Waw usually plays better as tournament progresses....I expect a fight from him. At this point, Waw at his best will crush current Fed in straight sets. If Fed will "show up" - then Waw would need to extend the match the longer the better....the longer the match goes on the less chances Fed has.
For Fed, he needs to come in and get it done, fast, brutal, no mercy. Should he "wonder" around he will find himself in a long match losing.