Kelly Sotherton has won Britain's first medal of the World Championships, taking bronze in the heptathlon.
Sotherton had dropped back to fourth place, but raced back into the medals in the last event - the 800m.
Another British athlete - Jessica Ennis - took fourth place, finishing 41 points behind Sotherton.
The heptathlon - were athletes compete in seven events - was won by Carolina Kluft of Sweden, who broke the European record with her performance.
Elsewhere, British sprinter Marlon Devonish finished sixth in the 100m final.
The event was won by America's Tyson Gay, with world record holder Asafa Powell of Jamaica only managing bronze.
Britain's Christine Ohuruogu eased into the 400m semi-finals, with her best run of the season.
She will be joined in Monday's semi-finals by team-mates Nicola Sanders and Lee McConnell.
Britain's Laura Turner, Montell Douglas and Jeanette Kwayke sprinted into the 100m quarter-finals.
But there was disappointment for Andrew Lemoncello, who finished last in his heat of the 3,000m steeplechase.