ATP World Tour Finals: Andy Murray blames serve for defeat

Andy Murray says his serve let him down after he was beaten in straight-sets by Japan's Kei Nishikori in his opening ATP World Tour Finals match.

The Briton fought back from 4-1 down in the second set to level, but Nishikori broke serve for a third time to win 6-4 6-4.

Murray says he still hopes to claim a semi-final place from Group B, with the Briton still to play six-time champion Roger Federer and the in-form Milos Raonic.

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