Brandon Williams Rebounds Prop is currently Over/Under 3.5 (-150/+120).
The money has been on the Over as it opened 3.5 @ +115 before it was bet up to 3.5 @ -150.
FACTORS THAT FAVOR THE OVER:
The 2nd-quickest tempo team in the league over the last 25 games has been the Mavericks.
The Grizzlies have played at the 2nd-speediest tempo in the NBA over the last 10 games, which ought to increase plays for the Mavericks.
FACTORS THAT FAVOR THE UNDER:
The Dallas Mavericks have been the 6th-worst offensive rebounding offense in the league this year (offensive rebounds maintain possession, and a lack of them can therefore reduce extra opportunities for scoring and assists).