Shirtless 'Sandlot' Star Marty York in Fist Fight Outside L.A. Club, on Video

Here's "The Sandlot" star Marty York getting into a physical altercation with another man outside a Hollywood hot spot ... Marty throws a couple of punches, takes a couple to the face, and rips his shirt off ... and it's all on video.

TMZ obtained footage showing Marty fighting with a large, muscular man Saturday outside the Warwick nightclub on Sunset Boulevard ... the brawl starts on the sidewalk outside the venue, then spills into a nearby parking garage.

Marty takes his shirt off as they box in between a bunch of parked cars ... and it looks like both men are pretty wobbly ... Marty's opponent even falls to the ground after throwing a flurry of punches.

The actor, who played Alan "Yeah-Yeah" McClennan in "The Sandlot," tells TMZ ... "Some unknown individual charged at me, and I had to defend myself."