Now up 2-1 in the series, the Lakers smell blood. Stifling defense is the Lakers' ticket to beating the Rockets. It's something the Lakers are well aware of since they did it during the fourth quarter in each of their Game 2 and Game 3 victories. Houston is averaging 205 1/2 points during the past two games. The Rockets managed just 20 points in the fourth quarter during the last game. 
The Lakers are more than capable of playing elite defense. They ranked third in defensive efficiency and fourth in fewest points allowed during the regular season. 
The Rockets won the first game of this series still pumped and with adrenaline flowing after getting past Oklahoma City in seven games. But the Rockets have hit a fourth quarter wall running out of gas. Houston coach Mike D'Antoni admitted his team's legs got tired in the fourth quarter. The Rockets are the more fatigued team. The Rockets had a day off before Game 3. They'll have a day off before this Game 4. But their tiredness, energy and execution aren't going to be fully restored this late in the bubble with just one day of being idle. 
The Under has cashed 12 of the past 15 times the Rockets have played with one day's rest. 
The perception is the Rockets are just all about offense with James Harden and Russell Westbrook spearheading a smallball attack. That's misleading. The Rockets were middle-of-the-pack defensively. The Rockets are the smallest team in the league by design. But the Lakers aren't going to kill Houston inside because Frank Vogel believes LA's best lineup is a small one, too. There wasn't any Dwight Howard in Game 3. 
There are going to be plenty of 3-point shots. But the Rockets aren't accurate shooters. Both teams also are strong defending against shots from beyond the arc, each ranking in the top eight in defensive 3-point shooting percentage. 
The teams haven't been up-tempo either. The pace has been slow. That's a key factor that can't be overlooked in making this Under work.