Kendall Graveman is one of my least favorite starters. The combination of Graveman making his first start in two years after being out last year recovering from Tommy John surgery and the Astros coming off a loss puts me on Houston. I see this as a kill spot for the Astros - as does the oddsmaker - so I'm laying the run line to reduce the vigorish.
Houston had defeated Seattle 15 straight times until losing, 7-6, to the Mariners on Sunday. The Astros also are 12-1 the past 13 times hosting the Mariners.
Graveman had a 7.60 ERA when he last pitched in 2018. 
Houston is going with Josh James, one of its many talented young pitchers. James had 100 strikeouts in just 61 1/3 innings last year. He is 2-0 with a 2.20 ERA in four career starts. James knows he could have a big role if Justin Verlander has a serious elbow injury. 
The Mariners are in full rebuild mode while the Astros are one of the best teams in baseball.