LONDON (AP) — Laura Ludwig and Sara Goller beat German teammates Katrin Holtwick and Ilka Semmler 21-16, 21-15 on Friday to advance to the quarterfinals of the Olympic beach volleyball tournament.

Mariusz Prudel and Grzegorz Fijalek of Poland also advanced in the first round of knockout play, beating Sascha Heyer and Seba Chevallier of Switzerland 21-18, 21-17.

The men's and women's round of 16 continued later Friday and Saturday.

Americans Todd Rogers and Phil Dalhausser, the defending gold medalists, were scheduled to play Italy later Friday. Americans Jennifer Kessy and April Ross were to play Switzerland's Simone Kuhn and Nadine Zumkehr.