Yes he can guard big, slow, Bagaric but can he guard fast and let say "modern" center of NBA. I say no not a chance.
I saw him play against Cibona Zagreb in euroleague, he play... let just say he didn't play. he play first 5-6 min and he was that bed that coach Blatt throw him out. He play again later but he can't guard Damir Markota (SEcound round prospect in 2006 draft) He was to fast for him. Getin' three points and jump shot all over the court