The Mavericks are several tiers above the Suns. They are a tremendous scoring team and are a bit below-the-radar even though they are 40-28. Dallas has lost by four or fewer points in six of its last eight defeats. 
Dallas still is steaming from its last game, a 153-149 overtime loss to the Rockets two days ago. The Mavericks blew a 3-point lead with three seconds left in regulation. Dallas is 20-7-1 ATS following a loss. 
The Mavericks now step way down in class. The Suns were only invited to Orlando to fill out the number of teams. On top of this, Phoenix is a bit fat and happy after opening the rebooted season with a 125-112 victory against the Wizards, who are the worst team in the reboot. 
The Suns lack the Mavericks' depth especially with Kelly Oubre Jr. and Aron Baynes both out. 
Phoenix is 6-13 ATS in its last 19 games.