Luke Ridnour will start in place of Kemba Walker (groin) vs. the Celtics on Friday. He's been the backup to Kemba since joining the team after the trade deadline. Ridnour's numbers with the Bobcats are not great, making 35.0 percent from the field for 3.1 points per game in 13.3 minutes. He's a risky option in fantasy leagues with 13 games tonight.