Ana Guevara of Mexico race a well-paced race to win the women's 400 metres at the World Athletics Championships, at the Stade de France, in Paris on Wednesday.

The bronze medallist of the last championships in Edmonton who was recently crowned Pan American champion, overcame Jamaica's Lorraine Fenton and Senegal's world champion Amy Mbacke Thiam, who both defeated her in 2001, to win in 48.89 seconds.

Fenton ran a season's beat 49.43 seconds but was forced to settle for the silver while Mbacke also did a season's best of 49.95 seconds to take the bronze.