Ivan Dodig did the same (against a much better playing Novak in 2011 AO).are you serious? Wayyyy past his prime hewitt took a set off of novak at his BEST SLAM in his PEAK PERIOD!
As Kragster said, there's a significant difference between troubling a player(taking a set) and beating said player.
Hewitt was a downward spiral at the time (since 2006 actually) but that was hardly the year in which Novak played his best grasscourt tennis either.4 sets against old broke down hewitt.
I think the question is answered.