Greg Heffley and sports are not compatible at all. After an unsuccessful competition at school, he finally decides that he has officially ended his sports career. But at mom's request to give the sport another chance, Greg reluctantly agrees to sign up for basketball. And although he is sure that he will not be able to pass the selection, he suddenly gets into one of the city's teams. When Greg and his new teammates start the season, their chances of winning at least one game are slim. However, anything can happen in sports. And when everything is at stake and the ball is in Greg's hands, will he be able to succeed? Will he eventually become a sports star?