An MRI confirmed that Tim Duncan suffered a chest contusion during Wednesday's game, and he's doubtful to play on Friday. The good news is that he didn't break a rib or suffer any more serious damage, and he'll be with the team when they travel for games in L.A., Portland and Denver. If he's forced to miss any games, expect more playing time for Tiago Splitter, Boris Diaw and Jeff Ayres.