Down 2-1 in the Western Conference finals and facing what they call a must-win Game 4 tonight, the Phoenix Suns talked about mental and physical fatigue.

MVP Steve Nash had questioned his team's body language and whether it had the "necessary fire" after a 95-88 loss to the Mavericks in Game 3, according to the Dallas Morning News, and Nash did not back away Monday.

"The thing that is frustrating is I don't think we've left it all out there the last few nights," Nash said. "Maybe guys have been saving themselves because of fatigue, but we can't afford to do that."

Shawn Marion, held to 10 points in Game 3, said he was "mind tired."

"It could be fatigue," added Boris Diaw. "You don't want to have excuses. Even with fatigue, it's more of a mental thing. You have to put it in your head that you're ready to go."