Every sportsman should have sportsmanship.
When defeated, he should greet his opponent and congratulate him. If he can't, no one will care to be his opponent because he lacks basic courage and the spirit of a good sportsman.
A true sportsman has a generous heart. He can admit to his loss and does not act with anger. Learning to have sportsmanship is very important. It doesn't always matter whether one wins or not.
What you have learned is more important than the results.