But I suspect Dipoto is right, that with the bullets Seattle has left to shoot this week, a lights-out reliever is the top target. But.

Even after the acquisition of first baseman Josh Naylor last week, the Mariners plan to aggressively pursue more roster upgrades before the MLB trade deadline at 3 p.m. PT Thursday.

The Seattle Mariners' lineup is set as they open a three-game series against the A's in Sacramento with shortstop J.P. Crawford getting the day off.