The chances of Peter getting trough to the semifinals is as slim as the chances of Paul McCarthney releasing a rap album
Today Peter struggled a lot to defeat Sato. All kudos to Sato who has improved a lot during the last year, but from what I can see he is no near the level of the top 5 in the world yet. Sato might be as fast as Lin Dan and Lee Chong Wei, but he doesnt have the technical and tactical skills that the truly best posseses.
From my point of view you can see Peter lacks a bit of speed, stamina and the final touch on his strokes. All that is a combination of lots of injuries recently and age catching up with the gentle dane. You have to remember Peter has only gotten like 5-6 weeks of preparation to this event whereas most of the other shuttlers have stayed out of injury and has prepared very well. Morten Frost said today during the match between Sato and Gade that Gade had lost some power in his attacks and generally lost speed compared to when he was young (pre knee injury period). Furthermore Frost mentioned and didnt understand that Peter almost never uses a clear to the baseline as an attacking stroke.
I agree with Frost and has for many years since Peter came back wondered why he didnt use a clear more often. With a change in playing style from a powerful super fast smashing machine to a more deceptive and decently fast attacker, it would in my opinion be obvious to use the clear as a deceptive shot. By mostly only using drops, cuts and smashes you will have to make a lot of winners, specially on your smashes since the opponent else can/will move forward on the court since he/she knows that there mostly wont be played a shot to the baseline. Peter has after his comeback in 2002 mostly had problems with people being strong defensively (CJ, LD and LCW). Due to his smashes not being as big a winner as before he finds it hard to win these guys since he in my opinion is playing the shuttle stereotypically in most situations. I think we will see Lin Dan be standing up front on court reaching a lot of Gade's shots very early and by that eliminatin Peters game.
A Peter on 100% would maybe stand a chance of 15-20% on beating LD, but as I see it with his current condition the chances are 0-5%

. This may sound a bit negative, but im only trying to be realistic here. I have big respect for Peter and think he has been one of the best shuttlers in MS for the last 15 years and maybe been THE ONE who changed mens single to what it is today by making strokes like drives in single very general.