No day of the week is better for baseball Unders than Sunday. It's usually a getaway day and also the most frequent day when starters are rested. 
So I'm expecting to see a number of reserves from both teams.
 
Another big factor for an Under is Framber Valdez starting for Houston. He's back in form since coming off the injured list being 2-0 with a 1.47 ERA. He has a 22-to-4 strikeout-to-walk ratio in 18 1/3 innings. The Twins are familiar with Valdez. He pitched five scoreless relief innings against Minnesota during the Astros' Game 1 AL wild-card series last year. 

Michael Pineda gets the starting call for Minnesota. He didn't have a good outing two starts ago, but posted a 2.62 ERA during his first eight starts this season.