Sabine Lisicki and Christopher Kas have caused an upset in the first round of the Olympic mixed doubles with a three-set victory over second seeds Liezel Huber and Bob Bryan.
The Germans took the first set thanks to a 7-5 win in the tie-break, before the American pairing levelled things up with a 7-5 triumph in a second-set tie-break.
With the match going into a super-tie-breaker, Lisicki and Kas sealed the surprise win 10-5.
They will now face Roberta Vinci and Daniele Bracciali of Italy in the quarter-finals.
