Japan has added 16-year-old sprinter Abdul Hakim Sani Brown to their squad for this month's World Athletics Championships in Beijing, making him the youngest athlete to represent the country at senior level.

Born in Fukuoka to a Japanese mother and Ghanaian father, Sani Brown broke championship records on his way to two gold medals at the world youth championships last month. He clocked 10.28 seconds in the 100-meter dash and 20.34 in the 200, the second bettering the mark set by Usain Bolt in 2003, for the sprint double.