A Yankees fan apparently took The Rivalry too far.

A fan threw a ball at Red Sox left fielder Alex Verdugo that hit him in the back during the sixth inning of the Yankees-Red Sox clash Saturday night at the Stadium.

An irate Verdugo and the Red Sox left the field after the disturbing incident, but play quickly soon resumed on a wild and rainy night in The Bronx.

Security caught and ejected the fan who threw the ball.

Gary Sanchez hit a solo homer, just over the right field wall later in the inning and Gleyber Torres followed with his own blast to give the Yankees a 3-1 lead, which they held onto in a rain-shortened victory.

It was the Yankees’ first win in eight tries against the Red Sox this season.