The most challenging stretch of the Heat season is finally over, and it ended Saturday with another win against another playoff-caliber team, but also with the loss of Miami's starting point guard. Even with the Heat again playing well — as it did in Saturday's 103-98 victory over visiting Denver — this season continues to be littered with speed bumps. The latest: a knee injury to Mario Chalmers, who looks like he could be out for awhile. Chalmers, unable to put any pressure on his right leg, left for good with a sprained knee late in the first quarter. He will get an MRI on Sunday. "He's walking around with a brace on," coach Erik Spoelstra said. "We'll have to wait and see. The unknown is probably worse than anything."