These are stupid questions. Everyone of the games is a must win, or none of them are. You have to win 4 games to win the le, so you MUST WIN 4 games. I get the point of the question, but really... if you lose game 4 it's no worse than losing game 3. So it's not a "must win" in the sense that it's over if you don't because of some momentum mumbo jumbo, but it is a "must play better" game. If Miami blows us out again in game 3, it's probably over. Spurs need to play better. But if they don't, then none of these games are "must win" because the Spurs just hit their ceiling. They aren't as good as the Heat unless they are firing on all cylinders and the Heat aren't. End of story.