​Kottasinghakkarage Nishan Madushka Fernando is a right-handed wicketkeeper-batter who has steadily risen through the ranks of Sri Lankan cricket. Educated at Moratu Vidyalaya, Madushka showcased his cricketing prowess early on, amassing over 1,000 runs during the 2018–19 school cricket season and earning the moniker 'Mr. Reliable' for his consistent performances.

Madushka's domestic career began with Colts Cricket Club, where he made his first-class debut in January 2019. He later represented Ragama Cricket Club, becoming a prolific run-scorer in Sri Lanka's domestic circuit. In the 2022 Major League Tournament, he topped the run charts with 1,229 runs in 15 innings, including an unbeaten 300, showcasing his ability to play long, impactful innings.

His consistent domestic performances earned him a spot in the Sri Lanka Emerging Team for their 2022 tour of England. During this tour, Madushka scored 269 runs against Kent, setting a record for the highest first-class score by a Sri Lankan in England, surpassing Aravinda de Silva's 255. ​

Madushka made his Test debut for Sri Lanka against New Zealand on March 17, 2023. He announced his arrival on the international stage with a double century against Ireland in April 2023, scoring 205 runs and playing a pivotal role in Sri Lanka's series victory.

In the limited-overs format, Madushka debuted in ODIs against the West Indies on October 20, 2024, making an immediate impact with a half-century. As of February 2025, he has played four ODIs, maintaining an impressive batting average and solidifying his place in the team.

Madushka's journey from school cricket to the international arena is a testament to his dedication and skill. With a solid technique, temperament, and the ability to perform under pressure, he is poised to be a mainstay in Sri Lanka's batting lineup across formats.