Is Marin Cilic going to be the next big factor in tennis?Can he breakthrough and win a slam this year?

Marin Cilic won the Chennai Open and had a very good run at the Aussie Open 2010. He survived two five setters against Del Potro and Andy Rod and was the first one to take a set off Andy Murray at the semifinals of Aussie Open. How far is he going to go as far as the rankings are concerned for this year?