Bolt doubles up in London

ATHLETICS: Triple Olympic gold medallist Usain Bolt has confirmed he will run in both the 100m and 4x100m relay at the London Grand Prix at Crystal Palace later this month.<br /><br /> The 22-year-old was scheduled to run the 100m but will now race on both days on 24 and 25 July as preparation for the World Championships on 15 August.<br />