BOSTON, MA – APRIL 28: Paul Pierce #34 of the Boston Celtics grabs the rebound against Jason Kidd #5 of the New York Knicks during Game Four of the Eastern Conference Quarterfinals on April 28, 2013 at the TD Garden in Boston, Massachusetts. NOTE TO USER: User expressly acknowledges and agrees that, by downloading and or using this photograph, User is consenting to the terms and conditions of the Getty Images License Agreement. Mandatory Copyright Notice: Copyright 2013 NBAE (Photo by Brian Babineau/NBAE via Getty Images)