#5. CF Kevin Pillar - .273/.333/.465
At 35 years young, Pillar is having the best offensive season of his 12-year big-league career. In an admittedly small sample size of just 190 plate appearances, he has a 122 OPS+ and is an ideal candidate for a rental bat. He doesn't do too much at the plate, avoiding strikeouts and sloppy whiffs while using ideal launch angles to compensate for a low exit velocity.
Pillar is on a one-year, $1 million deal with the Angels and is likely retiring after this year. After reaching a remarkable milestone of 10 years of service time, he has stated that he's essentially accomplished all that he has wanted to accomplish. With little chance of an extension, Seattle could ride this hot streak until the very end and maybe even give Pillar one last taste of the postseason before riding off into the sunset.