Bolt set his sight on a third straight victory in the 200m after Beijing ( 2008 ) and London ( 2012 ) .
Bolt moved a step closer to his goal when he won heat nine on Tuesday in just 20.28 seconds .
Setting his sight on a third straight victory in the 200m after Beijing ( 2008 ) and London ( 2012 ) , Bolt moved a step closer to his goal when he won heat nine on Tuesday in just 20.28 seconds .