Kousalya Murugesan aka Kowsi is the daughter of Murugesan, a farmer in Kulithalai, Karur. She aspires to become an international cricketer so she can put a smile on her cricket-loving father's face by helping the country win. The reason for this being portrayed in the initial scenes where Murugesan is very eager to see India's matches in the 2007 Cricket World Cup. However, he gets heartbroken on seeing India's crashing defeat to Sri Lanka in the group stages, which sees India getting subsequently knocked out. Murugesan controls his feelings before his daughter, but she witnesses him crying and being heartbroken throughout the whole night. Hence, this aspires a 11-year old Kowsi, to take up cricket seriously, represent her country, and win the world cup one day for her father's sake.

Kowsi joins the local cricket team in the village when she is 14, who were mostly her school seniors. Kowsi's off-spin bowling technique gets her wickets, and everyone starts appreciating her talent. At the same time, she also earns the wrath of many villagers as she plays cricket with boys wearing t-shirts and trousers, which is portrayed to be non-traditional. However, Murugesan does not care for this and he supports his daughter. Kowsi decides to appear for the Tamil Nadu team selection test, but she gets rejected in her first attempt. She does not give up and tries again where she succeeds and starts playing in Tamil Nadu women's team. Her hard work pays off, and she is selected in Indian women's cricket team. Kowsi goes to Bangalore to get trained in a national cricket academy.

Meanwhile, Murugesan faces a tough time with agriculture, as he is unable to repay the debt of Rs. 4 lakhs from a bank, resulting in a rift created between Murugesan and the bank manager. Kowsi faces a hard time in cricket academy due to internal politics where senior players ill-treating her as she cannot speak Hindi. The team's coach also hates Kowsi and demotivates her to a large extent. However, the coach retires, and there comes a new coach named Nelson Dilipkumar. Nelson, who was an ex-Indian cricketer, had to retire after his very first International Match as he sustained a terrible eye injury, leaving him partially blinded in the left eye. Nelson develops the team's spirit and gets the players ready for the upcoming T20 world cup. Nelson spots Kowsi's spin bowling capabilities and trains her in the right path. Nelson also locks horns with the team selection committee and ensures that Kowsi is present in the world cup squad. However, Nelson decides to rest Kowsi for the league matches, which makes her feel sad. However, Nelson reveals his strategy, that the intention was to hide Kowsi's talent from the opponents, and her bowling would be a surprise element in the semifinals.

Kowsi is selected in the playing eleven during the semifinal match against the strongest team, Australia. On that day, Murugesan's house is taken away from the bank manager for not repaying the debt. Kowsi hears this and feels bad that she is not with her father. However, Kowsi is motivated by Nelson to make her father proud by playing well in the semifinals. During the match, Kowsi bowls a hat trick and also hits a six while batting, resulting in a tie. During super over, Kowsi again bowls well, leading to India's win. Kowsi is appreciated for her bowling efforts and is awarded Rs. 5 lakhs for "Woman of the Match" award. Receiving the award, Kowsi gives an emotional speech describing the situation of her father and other farmers in the country. Murugesan feels very proud of seeing Kowsi. In the closing credits, it is shown that Indian women won the T20 final against West Indies women and Kowsi was appreciated by the Tamil Nadu Government for her superb bowling tactics.