Note to opposing batters and baserunners: Do not mess around with Lexie Grey on the hill.

In this sneak peek from tonight's Grey's Anatomy episode, "Put Me In, Coach," we get our first glimpse of Seattle Grace's softball game against Seattle Presbyterian. The hospitals' rivalry is intense.

But it soon gets personal when Mark begins canoodling with one of the opposing players, played by Holley Fain (cast as McSteamy's new love interest). She gets to first base ... in more ways than one.

Arizona (who's not the best catcher we've ever seen, but might be the cutest) explains who this new girl is, and Lexie is far from pleased. Jackson says he's happy, but his girlfriend clearly is not.

check out the tension, hilariousness and bench-clearing fiasco that ensues ...

Steve Marsi is the Managing Editor of TV Fanatic. Follow him on Google+ or email him here.