The Nigerian will line up against reigning world champion Danielle Williams, USA’s Grace Stark, Devynne Charlton of the Bahamas as well as four others in the first of three semi-finals.
The first two in each race will automatically qualify for Saturday’s final, while the two fastest non-automatic qualifiers will also join them.
The 27-year-old produced the second-fastest time in the heats, behind Olympic champion and Puerto Rico’s Jasmine Camacho-Quinn, who ran 12.42s.
Amusan was in high spirits after perfectly exciting her first-round race.
“The first time I came as an Olympian, I was like 18/19; the second time, I think I was a little bit experienced, and I didn’t get on the podium. This time I think, it’s my season,” said Amusan, who has now qualified for three consecutive semifinals at the Olympics.
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