Athletics: World Championships - 2009 - Day 4, Part 1

Continued live coverage from Berlin as Usain Bolt returns to the track in the heats of the 200m. American duo LaShawn Merritt and Jeremy Wariner are also in action in the men's 400m heats alongside UK champion Rob Tobin. Meanwhile, Britain's Charlene Thomas makes her major championship debut after winning the national title over 1500m.