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Sydney McLaughlin-Levrone set the world record on her way to winning back-to-back golds in the women's 400-meter hurdles.
The now two-time Olympic champion blew past the field in the final 100 meters on her way to setting the world-record time of 50.37 seconds.
McLaughlin-Levrone was level with her closest rival, Femke Bol of the Netherlands, through the middle of the race, but she was in a class of her own as the race hit its final stage.
Results
1. Sydney McLaughlin-Levrone (United States) - 50.