Boston Celtics coach Doc Rivers yells to his team during the first quarter of an NBA basketball game against the Houston Rockets Friday, Dec. 14, 2012, in Houston. (AP Photo/David J. Ph

 

              Boston Celtics coach Doc Rivers yells to his team during the first quarter of an NBA basketball game against the Houston Rockets Friday, Dec. 14, 2012, in Houston. (AP Photo/David J. Ph
Boston Celtics coach Doc Rivers yells to his team during the first quarter of an NBA basketball game against the Houston Rockets Friday, Dec. 14, 2012, in Houston. (AP Photo/David J. Phillip)