London: Making their debut as a team at the prestigious $7 million ATP World Tour Finals, the Indo-Romanian tennis combine of Rohan Bopanna and Florin Mergea came out with a brilliant performance to drub top seeds and defending champions Bob and Mike Bryan in straight sets in their men's doubles opening rubber of Group Ashe/Smith.

The eighth seeded pairing took exactly an hour to defeat the legendary American pair 6-4, 6-3 in the round robin encounter at The O2 Arena here on Sunday night. This was the winning pair's second win in four meetings over the Bryan brothers and their first on a hard court.