YOKOHAMA, Japan -- Sharika Nelvis and Devon Allen dominated the mixed shuttle hurdles relay as the United States won both finals at the world relays on the opening day Saturday.
Nelvis pulled ahead on the third leg and Allen anchored the Americans to victory in 54.96 seconds. Host Japan was runner-up in 55.59. Australia was disqualified and Jamaica did not start the mixed shuttle hurdles relay, one of two new disciplines making its debut at the meet in Yokohama.
The race featured two men and two women on each team running 110-meter legs.
In another event making its debut, Ce'Aira Brown and Donavan Brazier led the U.S. to first in the mixed 2x2x400-meter relay with a time of 3:36.92. Australia was second in 3:37.61 and Japan third in 3:38.36.
The U.S. leads the overall standings with 16 points, three ahead of Japan. Australia was third with seven points.
The competition concludes Sunday with finals in seven events.