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400 metres - Women (Heat A) World Record: 47.60 |
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| Rank | Athlete | Nat | Mark | |
| 1 | OGUNKOYA Falilat | NGR | 50.19 | |
| 2 | MILES-CLARK Jearl | USA | 50.21 | |
| 3 | OPARA Charity | NGR | 50.68 | |
| 4 | RICHARDS Sandie | JAM | 50.68 | |
| 5 | MALONE Maicel | USA | 51.06 | |
| 6 | AFOLABI Olabisi | NGR | 51.69 | |
| 7 | DAVIS Pauline | BAH | 51.77 | |
| 8 | YUSUF Fatima | NGR | 52.32 | |
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400 metres - Women (Heat B) World Record: 47.60 |
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| Rank | Athlete | Nat | Mark | |
| 1 | GRAHAM Kim | USA | 51.89 | |
| 2 | SIMASOTCHI Corinne | SUI | 52.96 | |
| 3 | BRAEGGER Anita | SUI | 54.04 | |
| 4 | BERNASCONI-OBERTI Paola | SUI | 54.59 | |
| 5 | BURKHALTER Jenifer | SUI | 55.66 | |
| 6 | ZAMBONI Nathalie | SUI | 55.74 | |
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