It is rough, and he certainly could lose pretty early especially since it is his first tournament of the year, but I think it is also unlikely.. Not sure Paire would really be able to do anything, Federer destroyed him Basel a couple of months ago. Davydenko showed great form in Doha, but we have to remember, the only two wins Nikolay has had over Federer was during that stretch where Federer wasn't playing near his best while Davydenko was definitely hitting top form, yet Davy was only able to take one set off Federer in Australia that year (albeit it was a pretty tight match but Davydenko never took 100% control anyways). Klizan would be much more interesting against Federer than Tomic. He definitely has a great lefty game and can overpower Roger while Tomic will be "out varied" by Federer like their other matches. If Raonic and Federer play during a night session and if courts are slow as they usually are, Raonic shouldn't be able to do much. His QF should be easy for him as well, however, I doubt it will be either Tsonga or Gasquet that play Federer.
Pretty much every slam since 2007?