Harrison Barnes Rebounds Prop is currently Over/Under 3.5 (+108/-133).
The money has been on the Under as it opened 3.5 @ -102 before it was bet down to 3.5 @ -133.
FACTORS THAT FAVOR THE OVER:
The Spurs will likely see a rise in possessions today from competing against the speediest pace-of-play road team in the NBA this year (the Toronto Raptors).