Once again, people are overrating Amare. Yes, I am aware he averaged 37 points a game 2 years ago, yes, I am aware that he is a freak athletically, and yes, I am also aware that he has improved him jumpshot and defense, BUT
1) He still cannot create his own shot. He may drive to the basket and dunk the ball once in a while, but he needs a point guard like Nash to set him up. He can't pass, he has no court vision, and the only thing he can do is catch the ball and make a basket. While his efficiency in doing this task make him more valuable than 90% of the players in this league, it still doesn't change the fact that if you stop Nash, you stop him.
2) His defense has improved, but that doesn't mean much. It's just gone from terrible to bad.
3) He has a low basketball IQ.
4) Shawn Kemp was as athletic as him, much better defensively, and can create his own shot (except against Mutombo), but you never saw Kemp hyped to this level.
The key to this series has been, and will always be Nash. If the Spurs can cut his passing (let him score all he wants), then the Spurs win.
The approach the Spurs take should be matching up with the Suns in offense shot for shot, keep the game close, then in the last quarter, put the clamps down, and suffocate their offense in spurts. Do this every game, because it's easy to score on the Suns, it's not so easy to stop them from scoring, so you only stop them for short stretches, when it is most important.