After their long East Coast road trip and a cross-country flight on Sunday night, the Mariners are back at it on Monday night. More importantly, they won’t get any respite after getting swept away in Boston. An ugly series like that almost demands an off day to get their heads straight and figure out a way to get back on the right track. It’s a small mercy, then, that the Athletics are in town for a three-game series before their off day at home on Thursday. It’s hard to say any series is “must-win” when we’re just a quarter of the way through the season, but the Mariners desperately need to string together some wins, if only to help remind us to enjoy the ride.