Trade grades: Celtics send Kemba Walker, No. 16 pick to Thunder for Al Horford in blockbuster deal, per report | CBS Sports Headlines Trade grades: Celtics send Kemba Walker, No. 16 pick to Thunder for Al Horford in blockbuster deal, per report Walker is getting a change of scenery while … Continue reading Trade grades: Celtics send Kemba Walker, No. 16 pick to Thunder for Al Horford in blockbuster deal, per report