One day after tying the record for most medals won by an American track athlete, Allyson Felix surpasses it by winning gold in the 4x400 relay. With the star-studded foursome of Allyson, Sydney McLaughlin, Dalilah Muhammad and Athing Mu, the U.S. continued its reign of dominance in the women's 4x400 relay, cruising to gold at the Tokyo Games. #usa #teamusa #allysonfelix #goldmedal #olympics #summerolympics #tokyoolympics