Srabani clocked 23.58 seconds at the Olympic Stadium, way below topper Cote d'Ivoire's Marie-Josee Talou (22.31 seconds).
American Deajah Stevens was second in the qualification round with a timing of 22.45, followed by compatriot Tori Bowie (22.47).
The first 24 athletes qualified for the semi-finals.
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