Rocky III

In 1981, 5 years after winning the world heavyweight championship against Apollo Creed, Rocky Balboa has had a string of ten successful title defenses, and his fame, wealth, and celebrity profile have increased. Rocky's manager, Mickey Goldmill, worriedly eyes a young and powerful contender rapidly rising through the ranks, James "Clubber" Lang. While unveiling a statue of himself at the stairway by the Philadelphia Museum of Art, Rocky begins to announce his retirement, but is cut short when Lang, now the number-one contender, publicly challenges him. Lang accuses Rocky of intentionally accepting challenges from lesser opponents, and goads Rocky into accepting his fight for the title.
Mickey initially wants no part of it; pressed by Rocky, Mickey confesses that he handpicked the opponents for Rocky's title defenses to spare him from another beating of the kind that Apollo gave him in their rematch. He explains that Lang is young, powerful and "hungry"; by contrast, Rocky is "civilized" and no longer has the stamina and strength to fight a boxer of Lang's caliber. Mickey tries to talk Rocky out of the fight but Rocky, shattered by the realization that all of his fights have been stacked in his favor, convinces Mickey to work with him for one last bout. Despite his promise to Mickey to "live in the gym", Rocky insists on allowing the public to watch him train in a crowded hotel ballroom filled with distractions. In contrast, Lang trains alone with ruthless determination and vigor.
Lang and Rocky meet at Philadelphia's Spectrum on August 15, 1981. Pandemonium erupts backstage as Mickey is violently shoved by Lang, resulting in a heart attack due to an underlying heart condition evidenced during Rocky's charity fight with pro wrestler Thunderlips. Distraught, Rocky wants to call the match off, but Mickey urges him on while he receives medical care in the dressing room. Rocky's lack of preparation is worsened by his concern for Mickey, preventing him from fully concentrating on the fight. The match begins with Rocky pounding Lang with several huge blows, looking for an early knockout, but Lang quickly recovers and takes charge, dominating Rocky and finishing him off with a haymaker left hook in the second round, winning the world heavyweight championship. After the match, Rocky tells a dying Mickey that the match ended in a second-round knockout without saying who the victor was. Mickey tells Rocky, "I love ya, kid", and dies. Rocky, lapsing into severe depression, mourns over Mickey's death.
Stopping by Mickey's closed gym, the forlorn Rocky encounters his former rival Apollo, who witnessed the match as a guest analyst. Apollo offers to help train Rocky for a rematch against Lang in exchange for a future favor, which Rocky accepts. Apollo then takes Rocky to the gym where he once trained, Tough Gym in Los Angeles. Apollo becomes frustrated by Rocky's lack of effort, as the latter is still haunted by nightmares of Lang and unable to train without Mickey by his side. Rocky regains his focus, though, after Adrian helps him come to terms with Mickey's death. Apollo and his manager, Tony "Duke" Evers, infuse Rocky's undisciplined brawling style with more of Apollo's trademark footwork, skill, and speed, rebuilding him into a more complete fighter.
After months of training, the rematch takes place at Madison Square Garden in New York City. Apollo lends Rocky the American flag trunks that he wore during their first match. At the outset of the match, Rocky sprints from his corner, battering Lang with a level of skill and spirit that no one ever expected. Rocky completely dominates the first round, leaving Lang enraged and bewildered after the bell. Lang gains the upper hand in the second round, and Rocky adopts an entirely different strategy that angers and confuses Apollo by intentionally taking a beating from Lang, even getting knocked down twice, all the while taunting Lang that he cannot knock him out. By the third round, Lang, who is used to winning matches swiftly with knockouts in the early rounds, loses his temper and starts throwing punches wildly as Rocky taunts him and Lang gradually runs out of stamina. With Lang rattled and vulnerable, Rocky strikes back with a flurry of punches, culminating in a brutal knockout to reclaim the heavyweight championship.
Afterward, Rocky honors Apollo's favor: a third match, albeit this time in the form of a friendly sparring match at Mighty Mick's Gym. The film concludes with the two simultaneously throwing the first punch, showing two equally skilled athletes facing each other not as rivals, but as friends.