Australian Open- Djokovic
French Open- Nadal (Djokovic if Nadal isnt back to top form)
Wimbledon- Nadal (Murray if Nadal isnt back to top form)
U.S Open- Murray
Federer or Del Potro could sneak out a slam perhaps, although I wouldnt predict one would either, it wouldnt shock me if one (not both) won one. Anyone else- Berdych, Tsonga, Raonic, Ferrer, would be a huge surprise.