London: India's Rohan Bopanna and Romanian Florin Mergea entered the semi-finals of the prestigious $7 million ATP World Tour Finals despite going down to Italian pairing of Fabio Fognini and Simone Bolelli in their men's doubles third match of the round robin encounter here on Thursday.

The fifth seeds Fognini-Bolelli completed their campaign with a 6-1, 1-6, 10-5 victory in 61 minutes over eighth seeds Bopanna and Mergea, who were already assured of topping Group Ashe/Smith at The O2 Arena here.