Toronto at Seattle

Seattle has won 12 of 16 and it is in first place in the AL West, three games ahead of the second-place Athletics, who just lost two of three to the Mariners. Toronto has lost four of five overall and seven of eight against AL West opponents. The Blue Jays are 1-5 in Kevin Gausman's past six starts in the first game of a series. The Mariners are 7-0 versus teams that scored at least five runs their previous game and they are 5-0 in Luis Castillo's past five outings against teams that allowed five or more runs their previous game. Seattle has won 10 of 14 home games against the Blue Jays. Castillo has allowed just a run on five hits his past two starts covering 12 innings. Take the Mariners.