He is quite greedy, so I think he will retire only in 2016. He will be a threat at the next 8 slams and will probably win one of them. Finishes with 18 slams and a couple more Masters, probably even one more WTF.
He wants this tourney to complete the resume. I dont see how anyone can stop him when hes this hungry. MUST WIN for Nadal to add to his legacy-90sClay