Bryce Harper someday joining the Cubs has been prime speculation fodder this summer.

But does Harper know something we don't?

The Washington Nationals superstar — who's slated to become a surely record-breaking free agent after the 2018 season — posted a picture of him and fellow Las Vegas native Kris Bryant on Instagram after Tuesday night's game between the Cubs and Nationals in the nation's capital.

A nice picture, sure. But the important part is the hashtags, one of which is #Back2BackOneDay.

Oh really, Bryce?

Is baseball's biggest star hinting at a potential future in a Cubs uniform, batting right behind Bryant, the Cubs' current All-Star third baseman and reigning National League MVP?

Let the speculation train continue to roll down the tracks. Harper's certainly providing enough energy.