Tyson Chandler should have been smiling from ear to ear in the locker room yesterday after his Knicks whipped his former team, the Mavericks, justifying his decision to leave Dallas. But he was in too much pain. Chandler took two tumbles in the 104-97 Garden matinee win, and was in discomfort, nursing two sore wrists and a sore tailbone. Chandler acknowledged he was questionable for tonight's game against the Nets, though X-rays on his wrists were negative. A Knicks official said Chandler will be reevaluated before tonight's game. "This is the worst I felt all season,'' said Chandler, who had 14 points and 10 rebounds and shot 5-of-7 as he continues to lead the NBA in field-goal percentage (70.5). "I had a rough night. I came down awkwardly. You always know more in the morning."