RIO DE JANEIRO:

This file photo taken on August 18, 2016 shows Jamaica’s Usain Bolt (2ndL) laughing with Canada’s Andre De Grasse (L) after they competed in the Men’s 200m Semifinal during the athletics event at the Rio 2016 Olympic Games at the Olympic Stadium in Rio de Janeiro. Jamaican sprint legend Usain Bolt labelled himself the underdog on Tuesday as he seeks to round off his glittering individual track career with the defence of his world 100m title this week.