Greg Heffley and sports just don't mix.

After a disastrous competition at school, Greg decides that he's officially retired from ANY kind of sport! That is, until his mum persuades him to give it one more go and makes Greg reluctantly agree 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. 

As Greg and his new teammates start the season, their chances of winning even a single game look slim. But in sports, anything can happen. 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?