The A's were playing Houston Sunday for a day game, and during the 7th inning ... Astros pitcher Humberto Castellanos beaned A's outfielder Ramon Laureano in the back, which ticked him off. He had words for Castellanos, but then directed his anger at the dugout.

It looks like one of the Astros hitting coaches was chirping at Laureano, which then prompted the A's slugger to charge the dugout. Several Astros players stepped in before Laureano could reach his target -- it looks like Dustin Garneau took him down and others piled on.

This led to the benches clearing and other players to tussle and wrestle on the ground, while others tried pulling one another off. Some were wearing masks, others weren't -- and the fact it was the first actual physical brawl of the COVID-era season made it all the more bizarre.

Of course, there's likely going to be some harsh penalties dished out here because of this -- MLB has strongly discouraged physical closeness/confrontations ... especially if they can be avoided. They've said they'll hand down whatever regular fines or suspensions they normally do in these types of situations, but won't cut 'em down at all for the shortened season.