Cleveland's highly touted rookie running back, whose career at Tennessee was slowed by knee injuries, hurt his left one in the second quarter of Thursday night's 13-10 win over the Chicago Bears, a potentially major blow to the Browns' running game.

Fellow rookie Colt McCoy got his first pro start and went a perfect 13 of 13 for 131 yards in two-plus quarters. The former Texas star fumbled his first snap, but finally showed some potential in easily his best performance of an otherwise rough preseason.

Quarterback Todd Collins, recently signed by Chicago to back up Jay Cutler, completed 10 of 15 for 139 yards and a 15-yard TD pass to tight end Greg Olsen for the Bears.