A fan at a Seattle Mariners game left the ballpark this weekend with a gnarly gash on his forehead ... after he took two HUGE punches to the face during a fight in the stands.
The wild scene was all captured on video during the Mariners' game Friday night against the Oakland A's ... when two fans got into an argument that turned violent.
In the footage, you can see the two were quarreling ... when the man in a Mariners jersey suddenly unloaded a massive right to the other guy's face.