I was going to say that "post scorers don't beat Boston" but then I saw that Kendrick Perkins is still out.
Hmm, the Celtics still got a lot of excellent post defense with Rasheed Wallace, Kevin Garnett and Glen Davis though. I don't think any player has caused Duncan as many problems throughout his career as Wallace has. Sheed and the Blazers were the first team to consistently make Duncan's life miserable and that continued on through to Detroit. They have had many great battles with Sheed doing well defensively against Duncan. So even without Perkins in the lineup, the Celtics should still have more than enough post defense to contain Tim Duncan.
Ergo, San Antonio will have to dominate elsewhere in order to get a win against Boston. Likely the backcourt with George Hill and Manu Ginobili or on the backboards with Blair, Dice & Co.