Nigeria’s Grace Nzubechi Nwokocha finished fourth in a new personal best in the last semi-final but was not quick enough to progress.
Mboma had broken the under-20 world and Olympic record for the first time earlier on Monday in her heat of the women’s 200m.
The 18-year-old’s time of 22.11 seconds eclipsed the time set by the USA’s six-time Olympic champion Allyson Felix, as she won silver at the Athens Games in 2004.
Her compatriot Beatrice Masilingi also set a personal best to progress to the semi-finals, along with Ivory Coast’s Marie-Josee Ta Lou, Niger’s Aminatou Seyni, The Gambia’s Gina Bass and Nigeria’s Nzubechi Grace Nwokocha.
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