Men's 100m gold medalist Jamaica's Usain Bolt, second left, stands with Men's 100m silver medalist United States' Justin Gatlin, left, and Men's 100m bronze medalist's United States' Trayvon Bromell and Canada's Andre De Grasse following the medal ceremony on the podium at the World Athletics Championships at the Bird's Nest stadium in Beijing, Monday, Aug. 24, 2015 (AP)
Supporters cheer while watching a broadcast of Jamaica's Usain Bolt winning the men's 100 metres final during the 15th IAAF World Championships in Beijing, in Kingston, Jamaica, August 23, 2015 (Reuters)
Jamaica's Usain Bolt is interviewed after winning the gold medal in the men's 100m at the World Athletics Championships at the Bird's Nest stadium in Beijing, Sunday, Aug. 23, 2015 (AP )
Supporters cheer while watching a broadcast of Jamaica's Usain Bolt winning the men's 100 metres final during the 15th IAAF World Championships in Beijing, in Kingston, Jamaica, August 23, 2015 (Reuters)
Jamaica's Usain Bolt smiles after winning the men’s 100m final at the World Athletics Championships at the Bird's Nest stadium in Beijing, Sunday, Aug. 23, 2015 (AP)
Usain Bolt of Jamaica (R) looks at the scoreboard after the men's 100 metres final at the 15th IAAF World Championships at the National Stadium in Beijing, China August 23, 2015 (Reuters)
Supporters react while watching a broadcast of Jamaica's Usain Bolt winning the men's 100 metres final during the 15th IAAF World Championships in Beijing, in Kingston, Jamaica, August 23, 2015 (Reuters)
Usain Bolt of Jamaica presents his gold medal after winning the men's 100m event during the 15th IAAF World Championships at the National Stadium in Beijing, China August 24, 2015 (Reuters)
Men's 100m gold medalist Jamaica's Usain Bolt holds up his medal on the podium at the World Athletics Championships at the Bird's Nest stadium in Beijing, Monday, Aug. 24, 2015 (AP)
Gold medalist Jamaica's Usain Bolt films the proceedings during the medal ceremony for the men’s 100m final at the World Athletics Championships at the Bird's Nest stadium in Beijing, Monday, Aug. 24, 2015 (AP)