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.

The executives running each team have wildly different ways of doing business — and this time of year, that governs which ...