Great Britain's Katarina Johnson-Thompson eighth as Nafi Thiam wins heptathlon
The defending champion came 10th in the 800m - the last of the seven events - to finish on 6,222 points.
Belgium's Thiam held off Anouk Vetter, registering her best 800m time to secure gold with a world-leading total of 6,947.
Vetter took silver with 6,867, while American Anna Hall claimed bronze.
Johnson-Thompson won the world title in Doha in 2019 but has struggled with injuries since then.
She recovered from a ruptured Achilles to make last year's Tokyo Olympics, only to see her dream of a first Olympic medal ended by a calf injury in the 200m.
Earlier, Dina Asher-Smith began her 200m world title defence by easily qualifying for the semi-finals in 22.56secs.
Britain's team captain Nethaneel Mitchell-Blake qualified for the men's 200m semi-finals, clocking 20.11, while compatriot Joe Ferguson also reached the semi-finals on his World Championships debut in 20.33.
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