Rohan Bopanna and his Romanian partner Florin Mergea reached the semifinals of the World Tour Finals with a straight sets win at london's O2 Arena.
The eighth-ranked side beat home favourite Jamie Murray of Great Britain and Australia's John Peers 6-3, 7-6 (7/5), the fourth-ranked pairing, to secure a semi-finals spot.
Bopanna and his Romanian partner beat US identical twins Bob and Mike Bryan, the reigning champions, in their opening group game Sunday.
They next take on Italian combination of Simone Bolelli and Fabio Fognini before the semis.
Kei outbattles Berdych
In the singles event, Japan’s Kei Nishikori beat Czech Tomas Berdych 7-5, 3-6, 6-3 to pick up his first victory of the year ending championship.
On Sunday, the 2014 US Open champion was swept aside mercilessly by World No 1 Novak Djokovic by a 6-1, 6-1 margin.
later, Djokovic faces Roger Federer - who had beaten Berdych in his first match of the group competition.