2011, no way. Djokovic was way too good at that event, and spanked Federer in the semis. The result wouldnt have been different on any slower hard court, in fact had it been a very fast hard court that day Djokovic likely would have even won given the form of both players. 2009 is doubtful at best as well. Federer hasnt beaten Nadal in a best of 5 match since 2007 now, and even that one (on grass) he won barely. I also fail to see the logic rebound ace greatly benefits Federer compared to plexicushion or plexicushion greatly favors Djokovic. Rebound ace was most certainly not a fast surface either, and it was higher bouncing than plexicushion.