BYDGOSZCZ, Poland -- The United States swept the men's and women's 100-meter relay titles at the World Junior Championships on Saturday.
Dante Sales, Antonio Sales, Marquise Goodwin and Terrell Wilks captured the gold in the men's field in 38.98 seconds.
Jamaica, which won the event at the last junior worlds two years ago in Beijing, took silver, and South Africa was third.
In the women's relay, Jeneba Tarmoh, Shayla Mahan, Gabrielle Glenn and Tiffany Townsend successfully defended the American women's gold medal in a time of 43.66 seconds. Jamaica was second (43.98) and Brazil was third (44.61).
Earlier, Teona Rodgers of the United States won the women's 100 hurdles title in 13.40.
There are athletes from 183 countries at the junior worlds, which opened Tuesday and will run through Sunday.