Caleb Martin Rebounds Prop is currently Over/Under 4.5 (+105/-135).
The money has been on the Under as it opened 4.5 @ -120 before it was bet down to 4.5 @ -135.
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).