espn/tnt & abc games are scheduled prior to the season. i believe abc has the right to change a game but they have to give a few weeks notice, and they obviously wouldn't want to put any game up against the NFL playoffs.
1/27 - Suns/Bulls, Cavs/Lakers
2/3 - Mavs/Pistons
2/10 - Nuggets/Cavs, Lakers/Heat
2/24 - Pistons/Suns
3/2 - Bulls/Cavs, Mavs/Lakers
3/9 - Spurs/Suns
3/16 - Mavs/Heat
3/23 - Spurs/Mavs
3/30 - Rockets/Spurs
4/6 - Pistons/Heat, Mavs/Suns
4/13 - Heat/Cavs, Spurs/Lakers
the celtics have no abc games, which is just brilliant planning on the part of the worldwide leader. the spurs/celtics is an espn game on 2/10 at 7pm. i would imagine they could flip that to an ABC game, considering it's the same network, if they'd like and if the NBA allows.