A hunt for kid-friendly sportsmanship tips turned up this advice from kidzworld.com:
~"Show up on time to practice, work hard, and listen."
~"If you lose, don't freak out, and don't be a whiner. Don't blame it on the refs [or] your teammates. Think about what you can do to play better..."
~"If you win big, don't show off or rub the other team's face in it. It's fun to celebrate a victory, but don't overdo it."
~"Be willing to sit out so other [team members] can get a chance to play -- even if you think you're a better player. Don't whine to your coach about not playing enough while the game is still going on. [Wait until] after the game [to ask] what you can do to get some more playing time."
~"Always cheer for your teammates, even if you're losing bad. You may be able to inspire a comeback."
~"Don't argue with the ref or the ump. Even if they got the call totally wrong, don't worry about it. Bad calls are usually made against both sides, and things will even out."
Competitive sports are a learning experience, sure, but sportsmanship makes them fun. If every kid, coach & parent were to take a moment, find the most courteous kid on the field, and commit to following his or her example, everyone really would win.