Colorado Rockies second baseman Ryan McMahon is starting at second base and batting seventh on Opening Day on Thursday against Marlins starter Jose Urena . McMahon swung the bat really well in spring training and won the starting job at the keystone over Garrett Hampson , but he'll have to perform to continue seeing regular playing time. He has upside hitting at Coors Field, but McMahon's daily value takes a bit of a hit batting lower in the batting order.