Olympics beach volleyball: US women into last eight

US beach volleyball players Kerri Walsh Jennings and Misty May-Treanor

Americans Kerri Walsh and Misty May-Treanor's hopes of retaining their Olympic beach volleyball title are on track after they reached the last eight.

The duo beat Marless van Iersel and Sanne Keizel of the Netherlands 21-13 21-12 at Horse Guards Parade.

World champions Emanuel Rego and Alison Cerutti of Brazil safely reached the quarter-finals in the men's event.

The top seeds beat Germany's Jonathan Erdmann and Kay Matysik 21-16 21-14.

Walsh and May-Treanor will now face Italian pair Marta Menegatti and Greta Cicolari who beat Spain's Liliana Fernandez Steiner and Elsa Baquerizo 21-15 21-15.

Beijing bronze medallists Xue Chen and Zhang Xi of China are also in contention after defeating Russia's Ekaterina Khomyakova and Evgeniya Ukolova 21-12 21-11.