Watch Tony Stewart Punch Heckling Fan In The Face At Racetrack

NASCAR legend Tony Stewart was driving in a sprint car race in Jackson, Minnesota on Friday night when he claims his engine blew out on him after just one lap. That's when a fan came over and gave him the business...

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A ton of fans flocked to the track to see the race star drive that night -- the Jackson Motorplex even advertised it as "Tony Stewart Night" -- so Tony stuck around afterward to sign some autographs.

That's when a heckler came up to Stewart -- and according to one eye witness, Brandon Woehl -- began cussing out Smoke for "quitting" only one lap into the race.

"F*ck you, Tony," the heckler allegedly said ... "You piece of sh*t. You come here and basically race for one lap and quit, you piece of sh*t."

That's when Woehl says Tony responded, firing back, "I blew my engine, you f*cking a-hole. Do you want to pay for it?"

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Language NSFW...

Woehl claims Tony said after the punch...

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"F*ck, I broke my hand."

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