Talk about an Olympic low blow ... some dude on the French basketball team just delivered a closed-fist scrotum punch to a Spanish player ... sending the guy crumbling to the floor in agonizing pain.
The ball-punisher is France's Nic Batum ... who obliterated Juan Carlos Navarro's bean bag in the 4th quarter of their quarterfinal matchup ... in an effort to intentionally foul the guy. Batum was NOT ejected from the game.
Seems testicle attacks are all the rage at the Olympics this year -- just yesterday, Team USA member Carmelo Anthony took a fist to the no-no zone from a guy on the Argentina squad.