Sanders, 25, from High Wycombe switched from the 400m hurdles to the flat in 2006, partly as a result of injuries. Her decision proved a good one when she claimed world silver in Osaka last year, behind GB team-mate Christine Ohuruogu. A niggling injury prevented her from running at July's trials, but if she can stay fit she has a good chance of medalling. The semi-finals of the women's 400m take place on 18 August, with the final the following day at 1410 BST. The BBC is not responsible for the content of external internet sites | 
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