Hold off on the talk for now of Mike Bibby becoming the starting point guard for the Heat. If there was any bright spot in the Heat's 87-86 loss to the Chicago Bulls on Sunday at AmericanAirlines Arena, it was the play of Mario Chalmers down the stretch. Chalmers scored five of his 11 points in the final 1:05. "If I have the opportunity, I'm going to make the most of it," Chalmers said. "If I don't, then I'm just going to cheer my teammates on. Hopefully, [Sunday] showed them that I can play down the stretch and that I'm ready for big moments." Chalmers, not Bibby, was the point guard of choice in the fourth quarter. Bibby played just 11 minutes, going scoreless on 0-of-1 shooting. Chalmers put the Heat in position to win when he hit a 3-pointer to tie it at 84. He then made a driving layup with 25 seconds left to put the Heat ahead 86-84 before the Bulls prevailed. "It's very frustrating, especially for us to be so close," Chalmers said. "We always get these big leads and control the game until the last couple of minutes. The fourth quarter, we've just got to figure a way to sustain."