LONDON >> One streak is over. The winning streak continues for two-time defending Olympic beach volleyball gold medalists Kerri Walsh Jennings and Misty May-Treanor.

The Americans lost the first set of their preliminary round match against Austria 21-17 on Wednesday night — the first time they’ve lost a set in three Olympics.

But they came back to win the second 21-8 and took the third 15-10 to remain unbeaten in this and every other trip to the Olympic Games.

Walsh and May-Treanor won seven straight matches in Athens and again in Beijing to collect a pair of gold medals. They won also their first two matches in London, a run of 16 matches.

Beach volleyball is best of three sets, the first two to 21 and the last to 15.

In men’s competition, Americans Jake Gibb and Sean Rosenthal beat Latvia in straight sets on Wednesday to win their Olympic pool and advance to the knockout round of the beach volleyball tournament.

Gibb and Rosenthal beat Aleksandrs Samoilovs and Ruslans Sorokins 21-10, 21-16. Both finished 2-1 in the preliminary round, and the Americans grabbed the first seed by virtue of point differential.

In other men’s beach volleyball play on Wednesday, Poland beat South Africa in straight sets, and Russia beat China 29-27, 17-21, 15-12.

In other women’s action, Germans Katrin Holtwick and Ilka Semmler beat Mauritius in straight sets; defending bronze medalists Xue Chen and Zhang Xi of China beat Greece in straight sets; Anastasia Vasina and Anna Vozakova of Russia beat Switzerland, 21-17, 19-21, 15-9; and top-seeded Juliana and Larissa of Brazil beat the Czechs in straight sets.