Geneva: Roger Federer and Stanislas Wawrinka slumped to a shock defeat in the Davis Cup on Saturday as minnows Kazakhstan opened a 2-1 lead in their quarter-final clash.

Andrey Golubev and Aleksandr Nedovyesov stunned Federer and Wawrinka 6-4, 7-6 (7/5), 4-6, 7-6 (8/6) in the doubles.