Indian ace Leander Paes [ Images ] and his Zimbabwean partner Cara Black [ Images ] suffered a straight-set defeat to Anna-Lena Groenefeld and Mark Knowles [ Images ] and bowed out of the mixed doubles at the US Open [ Images ] in New York on Tuesday.

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The second seeds, who won the 2010 Wimbledon [ Images ] mixed doubles title, lost 3-6, 4-6 to the German-Bahamian pair in the quarter-finals.

Paes and Black had clinched the Australian Open [ Images ] mixed doubles title in January.

India's [ Images ] Rohan Bopanna [ Images ] and his Pakistani partner Aisam-ul-Haq Qureshi [ Images ] are still in the reckoning in the men's doubles. They take on the South African-Belgian combo of Wesley Moodie [ Images ] and Dick Norman [ Images ] in the quarter-final.