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Diary of a Wimpy Kid novel follows middle-school student Greg Heffley as he is pressured into joining a basketball team, endures a disastrous season of losses, and stumbles into an unlikely moment of athletic glory.
Greg opens his diary by announcing his retirement from sports. He believes he lacks the genes that make people athletic, and his role on any team has always been to make everyone else look better. He recalls preschool soccer as joyful chaos where no one kept score, then contrasts it with kindergarten, where referees enforced rules and the coach benched him. His mom, Susan Heffley, told him the coach was saving him as a "secret weapon," which Greg took literally. His dad, Frank Heffley, always hoped Greg would become a star athlete, but Greg never shared his enthusiasm.
Over the summer, Greg watches the Olympics on television. Susan insists the family watch together, arguing that sports bring people together. Greg fantasizes about winning a gold medal but doubts he will ever become an athlete. When his school announces Field Day, a homeroom competition held every four years where the winners earn a day off, Greg tries to get in shape. His pregnant homeroom teacher, Mrs. Bosh, takes preparation seriously, sending a student into the ceiling to spy on a rival homeroom and trading students to strengthen her roster. She trades Greg and two others for Jesse Range, a student who stayed back twice to compete again. On the day of the event, the detention teacher, Mr. Ray, gives Jesse detention to claim him for his own team, leaving Greg on rival homeroom teacher Mrs. Epstein's squad. Greg wins the three-legged race only because his tall partner carries him. The day ends in scandal: Jesse is caught taking a bribe, a gambling ring is exposed, and Mr. Ray's team is caught using frozen water balloons. Vice Principal Roy gives everyone Friday off.
Susan pressures Greg to join a team sport, sharing that her happiest memories came from playing middle-school basketball, where her team reached the state finals. Greg picks basketball because tryouts have limited spots, expecting to get cut. He struggles through tryouts while Susan watches from the stands and advocates loudly on his behalf. Greg comes home to a surprise celebration: He made a team coached by Mr. Patel, the father of Preet Patel, one of the best athletes in their grade. Preet missed tryouts for a family funeral, making him ineligible for either official team, so Mr. Patel formed a third team from Preet and all the players who were cut. Greg's teammates include Jabari Bruce and Tommy Chu; brothers Darren and Marcus Woodley, who constantly fight each other; Edward Mealy, who has not spoken since second grade; Kevin Pomodoro, whose retainer makes his speech unintelligible; Yusef Meskin; and Ruby Bird, a tough girl placed on the boys' team after attacking an evaluator at girls' tryouts.
The team practices in the elementary school cafetorium, a combined cafeteria and auditorium, because the official teams have booked all the gym time. With no hoop and limited space, they work on dribbling amid lunch tables. Coach Patel punishes mistakes with wind sprints, which only tires the players and produces more errors. When the team finally gets late-night gym access, Men's League players arrive and claim the court. Coach Patel proposes a scrimmage, and the men dominate easily. Preet, frustrated, attempts a dunk but lands awkwardly and breaks his ankle, ending his season. Without their only skilled player, the team cannot score even in a five-on-zero drill.
Their games are disasters. The first, against Franklin, ends in a blowout with the score 38 to 6 at halftime. Greg mistakenly shakes hands with the opposing team, thinking the game is over. At Slacksville, the town's bitter rival, the team trails 52 to 0 at the half. Coach Patel's speech about representing their town backfires when players start fighting on the court. The losses continue all season. The rec league implements mercy rules and eventually drops Greg's team down two age groups, where they still lose to elementary school kids. Greg's only basket goes through the wrong hoop. At the end-of-season banquet, Coach Patel distributes participation awards and suggests the players consider careers like accounting or puppetry.
Greg is relieved the season is over, but Susan discovers the Second Chance Tournament, a state competition for winless teams. When Coach Patel declines to participate, Susan takes over as coach, distributes new uniforms, and names the team the Huskies after her own middle-school team. Her coaching style emphasizes team-building over drills, and during one exercise, Edward Mealy finally speaks, talking at length about his pet turtle.
The team travels to the tournament, held in a decommissioned state penitentiary. Forced to rename themselves the "Winter Dogs" because another team is already called the Huskies, they lose their first game to the Mathlete All-Stars. Susan then reveals a critical rule: Teams must keep playing until they win, and only winners go home. The Winter Dogs lose three more games. After an overnight hotel stay disrupted by a fire alarm evacuation, the field narrows as winning teams depart. The Winter Dogs face the Funky Dunkers, a team down to only five players, in the championship.
Before the game, Preet and Mr. Patel arrive. Susan asks Preet to play despite his walking boot, and he agrees. She scraps the playbook for a single strategy: "Get the Ball to Preet." Preet dominates offensively but cannot run, so the Funky Dunkers score easy baskets at the other end, keeping the game close. When Preet accidentally injures a Funky Dunkers player with his boot, the opposing team drops to four players. The ref says they must forfeit, but Susan insists on finishing fairly and offers to send one of her players to the other side. She chooses Greg, whispering that he is her "secret weapon."
Greg joins the Funky Dunkers, but his new teammates refuse to pass to him. He stands in a corner as Preet trades baskets with the opposing team. With time running out and the Funky Dunkers trailing by two, a missed three-pointer by Preet bounces to Greg. His former teammates swarm him. He glances at Susan on the bench and sees she is not rooting for him, realizing she sent him to the other team not as a secret weapon but because he is the weakest player and would hurt their chances. No longer caring about strategy, Greg heaves the ball to get rid of it. The shot arcs across the court and swishes through the net for a three-pointer, putting the Funky Dunkers ahead by one as the buzzer sounds.
Greg's new teammates mob him in celebration. For the first time, he understands why people care about sports. He collects signatures from the Funky Dunkers for the movie rights to their underdog story, and the group goes out for ice cream. Greg admits his mom was right that sports bring people together, but he concludes that sometimes it is best to quit while you are ahead.