By A Mystery Man Writer
The men's and women's teams won gold in the 4x400, plus Matthew Centrowitz won the first gold for the US since 1908 in the 1500 meters.
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Images
Olympics Rio 2016: Allyson Felix wins sixth gold as US win 4x400m
Allyson Felix wins 10th Olympic medal, makes history at Tokyo Olympics
Allyson Felix shifts into high gear to win the women’s 400
Allyson felix olympic hi-res stock photography and images - Page 7
Tori Bowie wins US 200m title as Allyson Felix's Rio double dreams