Top seeds Daniel Nestor and Nenad Zimonjic suffered a shock defeat in the ATP World Tour Finals when they were beaten by Poles Mariusz Fyrstenberg and Marcin Matkowski in their opening Group A round-robin match.
The Canadian-Serbian world number one pairing, this year’s Wimbledon champions, went down 6-4 6-4 at the O2 Arena to damage their chances of clinching the year-end top ranking.
American Bob and Mike Bryan, who are hoping to overturn an 930-points deficit in the rankings here, begin their Group B matches on Monday against Max Mirnyi and Andy Ram.
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