Asher Bradshaw

10-year-old skateboard phenom Asher Bradshaw was taken to a hospital and diagnosed with a mild concussion after a frightening collision during a competition this weekend ... this according to Asher's manager. As we previously reported, Asher -- who shot to superstardom after pulling off a 900…

Frightening moment for 10-year-old skateboard phenom Asher Bradshaw this weekend -- when the prodigy collided with another boarder at a competition in Venice -- and smacked his head into a wall, HARD. TMZ Sports was rollin' when Bradshaw -- who became famous for being the youngest skater to pull…