Boxer Amanda Serrano posted a wicked picture of the huge gash over her eye ... right after being defeated by Katie Taylor in a classic bout Friday night at the Mike Tyson vs. Jake Paul event.
Along with the hard to look snap ... she wrote, "To my fans I’m going to always give it everything I have. I’m a ruthless warrior & Katie is my buddy but Damn her best attribute is her head. No punching power but hard ass head lol."
Amanda got the nasty wound during her loss to Katie in a unanimous 95-94 score .