Didi Gregorius was almost a non-factor against southpaws when he first came to the Yankees, but an incredible transformation has made him one of the best lefty-on-lefty hitters in baseball this season. Oddly enough, he's now struggling against righties, giving him a unique (and opposite) platoon split.
Didi Gregorius hasn't had the greatest start to the season, hitting .276/.298/.400 with an 89 wRC+. That's not to say he's been awful, especially given his excellent-as-always defense, but an on base percentage under .300 just isn't going to cut it, especially when there's not much power or speed to go with it.