At the 2013 IPC Athletics World Championships in Lyon, Ntutu came away a double medalist, winning a silver in the 100 metres (behind Ireland's Jason Smyth) and a first major medal in the 200 metres, a third placed bronze. Two years later Ntutu sight was deemed to have deteriorated and he was reclassified as a T12 classification athlete. This allowed him to enter his first African Games, as traditionally the T13 sprint was not contested. Held in Brazzaville in the Republic of Congo, Ntutu entered the 2015 African Games competing in the T12 200 metre sprint. He took gold, finishing ahead of countryman and fellow ex-Athlone School pupil Hilton Langenhoven.