Being a Mariner fan aside ... there have been a few .. just as many pick the Angels to win the AL West also, so I am assuming it will be a dogfight to the end (I hope it is anyway).
http://nesn.com/2015/03/red-sox-will-lose-to-mariners-in-alcs-according-to-prediction-machine/
http://www.fangraphs.com/depthcharts.aspx?position=Standings
I could probably find more, but I'm supposed to be working!