| Rank | Lane | Athlete | Time | Records | Diff | + |
|---|---|---|---|---|---|---|
| 1 | 04 |
| 51.38 | - | + | |
| 2 | 05 |
| 51.39 | +0.01 | + | |
| 3 | 02 |
| 53.05 | +1.67 | + | |
| 4 | 03 |
| 53.26 | +1.88 | + | |
| 5 | 06 |
| 55.81 | +4.43 | + | |
| 6 | 07 |
| 58.89 | +7.51 | + | |
| 7 | 01 |
| 1:00.83 | +9.45 | + | |
| Rank | Lane | Athlete | Time | Records | Diff | + |
|---|---|---|---|---|---|---|
| 1 | 04 |
| 50.42 | - | + | |
| 2 | 06 |
| 51.86 | OC | +1.44 | + |
| 3 | 05 |
| 52.39 | +1.97 | + | |
| 4 | 03 |
| 54.49 | +4.07 | + | |
| 5 | 02 |
| 57.07 | +6.65 | + | |
| 6 | 07 |
| 57.58 | +7.16 | + | |
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