Sunderland suddenly saw an unlikely point in sight, but survived another scare 13 minutes from time when Hleb's cross found substitute Theo Walcott at the far post only for the youngster to miss his kick horribly.

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These are designed to scare gullible traders into offloading their own shares, at which point the HFT investors withdraw their own spoof trades and snap up the real ones.

ECONOMIST: The risks posed by high-frequency trading

Soderling had to save a break point at 2-3 in the second set and had another scare when falling awkwardly while hitting a forehand two games later.

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