A quarterback matchup of Tua Tagovailoa versus Kyler Murray is the headline to this matchup. But this is a sneaky Under play between two underrated defenses against offenses missing key running backs. 
The Dolphins have allowed an average of just 11.3 points during their last three games. Xavien Howard and Byron Jones are in the discussion for best cornerback tandem in the NFL. Miami won't have to worry about the Cardinals' starting tailback Kenyan Drake, who is out with an ankle injury. 
The Cardinals have a bend-but-don't-break defense ranking ninth in scoring defense allowing fewer than 21 points a game. Miami could be without its two best running backs. Lead runner Myles Gaskin is out with a knee injury and Matt Breida is questionable with a hamstring. This could open up carries for plodding Jordan Howard, who is the dream back for Under bettors. 
Arizona was idle last week. The Cardinals now have film on Tagovailoa, who wasn't impressive in his NFL debut against the Rams last week throwing for just 93 yards.