Watch: LeBron shows no mercy in water-balloon fight at son's birthday party

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Ken Blaze-USA TODAY Sports / Action Images

#LeBron chasing kids with water balloons at his son's birthday party. #BALLGOD

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LeBron James doesn't go easy on anybody.

The Cleveland Cavaliers superstar is kicking off his offseason with some good ol' family fun, celebrating his son Bryce's 10th birthday with a sports-themed bash Saturday.

Despite the younger competition, King James didn't seem to hold back in a water-balloon fight as he showed off his impressive throwing arm and ran around like it was an NBA game.

Here are more photos from the party:

#BryceMaximus #TeamBryce10

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#BryceMaximus #TeamBryce10

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Happy birthday, Bryce!