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

A Red Sox fan threw back Yankees slugger Giancarlo Stanton’s home run ball — and hit him with it — on Saturday.

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.

The fan’s throw one-hopped Stanton as he rounded second base.

The fan grabbed the ball after it went over the Green Monster, reached back and threw it as hard as he could. He did it without looking, replay showed.

WATCH: Yankees break HR record

After it hit Stanton in the upper arm, he looked toward the crowd confused. Third base coach Phil Nevin stopped the game for a moment to point to where the ball came from for umpires.

The fan was undoubtedly escorted out — and maybe one of the security guards bought him a beer.

Yankees notes entering the game:

AT A GLANCE: The Yankees play the second game of their final regular season series of the season today at Boston… are 4-1 on their final road trip of the season after winning on Friday and going 3-1 at Tampa Bay.

>>>   With their win on Friday at Boston, have clinched home field in Wednesday’s AL Wild Card Game vs. Oakland.

>>>   Are 8-3 in their last 11G after going 1-4 in their previous 5G… are 24-15 in their last 39G and 31-19 in 50G since 8/6.

>>>   At 99-61 (.619), have the Majors’ third-best record and third-most wins behind Boston (107-53, .669) and Houston (101-58, .635)… marks their highest win total since going 103-59 in 2009… need to win one of their last two games to record their 20th 100-win season in franchise history.

>>>  Are a season-high 38G over .500… prior to 2018, had not been 38G over .500 since finishing the 2009 season with a 103-59 record (44G over .500). 

RECORD RIVALRY RECORD: This year marks the second season in MLB history that the Yankees and Red Sox have each totaled at least 99 wins (also 1978: NYY 100-63; BOS 99-64).

Brendan Kuty may be reached at [email protected]. Follow him on Twitter @BrendanKutyNJ. Find NJ.com Yankees on Facebook.