Rookie Charles Spencer, a third-round choice who won the starting job in training camp, suffered a fractured left tibia in the third quarter of Sunday's loss at Indianapolis and will be placed on injured reserve, a move that prematurely ends his debut campaign. The injury occurred about six minutes into the third quarter on a running play on which tailback Ron Dayne gained no yards. "It's really sad," said coach Gary Kubiak. "The kid's going to be a great player. He needed this year. Now he's going to have to sit back and watch."