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17-year-old tennis player Katya is forced to quit the sport. Her family has neither money, nor connections, nor even the desire to fight for her dream of the world of big sports. Now tennis has become a way of survival for the girl. Pretending to be a beginner, Katya goes to private courts in Moscow and beats rich amateurs for money. Witnessing one of such "duels" is a former professional athlete Igor Strelnikov - a tired coach who has long dreamed of finding a truly gifted child. When he sees Katya, he realizes that she is the "unpolished diamond" and his chance to return to the world of professional sports. Igor makes the biggest bet of his career on Katya...
Igor refuses to meet with his mistress, Yana, who turns out to be Ruslan's wife. At the same time, Katya visits a doctor again, who advises her to refrain from playing until the surgery. However, Katya realizes that this is impossible, as tennis is her only source of income.
Katya not only gets to the tennis court by trickery, but also manages to earn money on the game with a stranger. Gives the money to mother Lena, but she is going to let them go again, not on them with her younger brother. Against the background of the conflict, Katya has a short-term loss of vision, she turns to an ophthalmologist for help.