Again going from what I am reading about the wicket. If its as bad as they say it is, this is a first innings bet.
Karunaratne is the main threat to this, but 25/33 batsman failed to get to 20 in the last game, these wickets are not easy to score off your looking at someone needing to survive 200-250 balls for a ton and on wickets like this, your likely to get one with your name on it. He was dropped several times too.
Apart from him and Mathews no one averages close to 40. I dont see where a ton is coming from bar those two.