Greg Heffley and sports just don't mix. After a disastrous field day competition at school, Greg decides that when it comes to his athletic career, he's officially retired. But after his mom urges him to give sports one more chance, he reluctantly agrees to sign up for basketball.

Tryouts are a mess, and Greg is sure he won't make the cut. But he unexpectedly lands a spot on the worst team. When everything is on the line and the ball is in Greg's hands, will he rise to the occasion? Or will he blow his big shot?