Momentum is crucial in the baseball playoffs. The Dodgers have it. The Rays don't. 
LA has won four in a row after being on the brink of elimination from the Braves. Tampa Bay is 1-4 in its last five games. The Rays haven't played well since going up 3-0 on the Astros in the ALCS. 
It doesn't hurt the Dodgers' chances that they are the superior team with both great hitting and pitching. 
The Dodgers led the Majors averaging 5.8 runs per game. They are averaging 5.5 runs in their last four games. Cody Bellinger has come alive smacking three homers during the last three games. The Rays don't have the offense to match LA's. Tampa Bay is averaging 3.1 runs in its last 10 games.  
The Rays are going with lefty Blake Snell, who has allowed seven runs in his last 14 postseason innings spread across three starts. He hasn't completed six innings during any of his playoff starts this season. This isn't the vintage Snell of three seasons ago. The Dodgers are 17-6 versus lefties this year, including 4-1 during the postseason. 
Tampa Bay is going up against Dodgers pitching that has allowed three or fewer runs in four straight games. The Rays are going to be looking at Tony Gonsolin and probably Julio Urias in this game. Gonsolin had a 2.31 ERA in the regular season with a 0.84 WHIP in 46 2/3 innings. Urias has a 0.56 ERA and 4-0 record in 16 playoff innings this season spread across four appearances.  
The Dodgers have won 77 percent of the time they've been favored during the past 56 instances.