The Marlins opened Sunday learning they’d be without one starting pitcher for roughly two weeks at least. And then they watched another struggle once again, putting them on course to a 7-3 loss to the Milwaukee Brewers on Sunday afternoon at loanDepot Park. The Marlins (15-19) put starter Jesus Luzardo on the 15-day injured list due to a left forearm strain, which could keep him out until at least the end of the month. And Elieser Hernandez once again couldn’t sustain early effectiveness past the fourth inning as the Brewers scored four runs in the top of the fifth — compounded by a throwing e…