"There's only a 50-50 chance the Cavaliers' starting backcourt plays against Chicago on New Year's Day.

Point guard Mo Williams was sidelined at Charlotte on Wednesday with a strained left hip flexor.

Also, shooting guard Daniel Gibson was knocked out of the Bobcats game with a left thigh contusion with 7 minutes, 19 seconds remaining in the third quarter. He didn't return.

Coach Byron Scott said both are listed as questionable against the first-place Bulls (20-10).

For a team lacking offensive punch, losing its Nos. 1 and 3 scorers is a death blow. Williams is scoring a team-high 15.3 points a game and is dishing out a career-high 7.2 assists. He suffered his injury in Tuesday's game against Orlando.

It's difficult playing without Williams, the Cavs' floor general."