Archie Tennis Ace

Stop-frame animation. The adventures of Frank and Buster, two intrepid young koalas who fly around the Australian Outback on a mission to help other creatures in need.

Archie is so good at sport that he wins every game and demands to play on until he is defeated. This means his friends don't want to play with him. Buster arranges for him to play Frank, who surprisingly beats him, then steps aside to let someone else play. Archie learns to share, and after that people are happy to play with him.