SAN FRANCISCO The Giants drafted Austin Slater in 2014, watched him hit his way through the minors, and had him in their big-league lineup more than 100 times the past two seasons. They still dont quite know what he is as a major leaguer, though.Slater, at his best, has a strong arm in the outfield, an opposite-fields approach that can put him on base a lot, and enough tools to be a solid contributor. But theres no doubt that he needs a serious launch-angle adjustment, and he had some odd moments defensively in 2018.