I'm not questioning the fact that Djokovic should get to 50 slams or so by the end of the year, but this will all change after the unveiling of THE FIFTH GRANDSLAM.
I am, of course talking about the Transatlantic Airspace Open. Sponsored by NASA, and played on the Wings Of Airplanes™, the TAO will be introduced in 2012. What it will lack in popularity with umpires and ballboys, it will make up for in sheer spectacles. Talking of spectacles, Janko Tipseravic is likely to be the only contender to Prince Novak's throne as he has thus far spent the whole of his career acclimatising himself to the specialized eyeware required for the event - in his dedication putting up with the suboptimal performance it grants him in the land-based tennis tournaments. This entirely explains his lacklustre grandslam results thus far.
Nevertheless, Djokovic has already shown his complete domination of the surface and if he can fend off the challenges of his fellow Serb, his only opponents should be altitude sickness, motion sickness, home sickness, windchill, an upset stomach, and sweat.
The Swiss can take the grass, leave the Spanish Armada washed up on the clay.
Serbia shall rule the airwaves.