Brett Gardner making case for another Yankees go-round

BALTIMORE — Brett Gardner and CC Sabathia re-signed with the Yankees within a week of each other last November, one-year deals and pay cuts for both, and the dual transactions carried the feel of the movie “Last Vegas,” a couple of baseball geezers going on one last joy ride together.

One problem existed with that narrative, however: While Sabathia immediately declared this season to be his swan song, Gardner never signed off on the script. And with the way he has played for the Yankees in 2019, exactly why shouldn’t they bring him back for 2020?

“At this point in the season, I expect to be playing next year. Hopefully it’s here,” Gardner told The Post on Wednesday, before the Yankees…