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WATCH: Red Sox fan hits Yankees' Giancarlo Stanton with ball

Giancarlo Stanton took one out over the monster to extend the Yankees lead, but then a fan threw the ball back and hit Stanton rounding 2nd. pic.twitter.com/8I9MuYaa7R

-- FOX Sports: MLB (@MLBONFOX) September 29, 2018

BOSTON -- Really?

A Red Sox fan threw back Yankees slugger Giancarlo Stanton's home run ball -- and hit him with it -- on Saturday afternoon at Fenway Park.

It's not unusual for a fan to throw a ball back onto the field.

What's weird is to hit someone with it.