Arizona Diamondbacks vs. Seattle Mariners odds, tips and betting trends

A series opener between the Seattle Mariners (13-12) and Arizona Diamondbacks (12-14) is scheduled for Friday at 9:40 PM ET, at T-Mobile Park. The Diamondbacks are a favorite (-134) against the Mariners (+113). The Diamondbacks will start Zac Gallen (3-1) against the Mariners and Emerson Hancock (2-2). The Mariners took down the Rangers 4-3 yesterday.