Jazz Chisholm Jr. has landed in some hot water following the Yankees' Thursday night matchup against the Tampa Bay Rays ... not for his actions on the field -- but for a social media post he published in the middle of their game.
MLB made the announcement Friday afternoon ... saying Chisholm Jr. received the one-game suspension and "an undisclosed fine" for violating the league's social media policy.
He will not serve the suspension Friday ... as he's appealing the league's ruling.