What? First off, how old is your brother? How much did he lose by? How did he do in the game? Based on what you have wrote, I would advise you to tell him to get his pansy ass back on the diamond.
You find me a professional baseball player, ANY professional baseball player, who never lost a game and I'll give you my right arm. That said, professional baseball players usually don't quit. That is how they made it to the big leagues.