Niranjan Mukundan won 10 medals in swimming – 7 gold and 3 silver – and was crowned Junior World Champion at the IWAS World Junior Games held in Stadskanaal, Netherlands in July 2015. He won gold medals in 50 m backstroke S8, 400 m freestyle, 100 m freestyle, 50 m butterfly S8, 200 m S8, 100 m backstroke S8 and 200 m medley SM8.