Britons Jamie Murray and Neal Skupski kept alive their hopes of reaching next week's ATP Finals with a first-round win at the Sofia Open.
The Britons are chasing the final spot in the doubles event at the prestigious end-of-season tournament in London.
They beat Slovakia's Igor Zelenay and India's Divij Sharan 6-3 3-6 10-6 in the Bulgarian capital on Monday.
Murray and Skupksi must reach the final here to have a chance of qualifying for the ATP Finals, which start on Sunday.
The pair need to overtake Jurgen Melzer and Edouard Roger-Vasselin, who currently occupy the eighth and final qualifying place.