Free MLB Betting Odds & Picks on the Seattle Mariners vs. Boston Red Sox Monday night game 1 matchup. The Red Sox are -180 home favourites. The over/under is set at 9. Q likes the home team in this one 6-5. Jason Vargas has been a pleasant surprise for the Mariners this year. Seeing the Mariners might enable them to extend their winning ways and normally you would like Jon Lester on the hill.