Whenever you are playing Blitzball, and currently are winning (i.e. your score is higher than the other team's) just swim behind your own goalie. Stay there and everyone else on the field will go to the other side and swim in circles. Sometimes, a member of the opposite team will follow you. Just shake him loose (breaking through him is an easy way) and he too will just leave you alone. Stay there for the remainder of the game and you will win.
