Britain's Dan Evans lost to Russian Karen Khachanov in the first round of the Dubai Duty Free Tennis Championship.
Evans, who received a wildcard for the tournament, had won all five of their previous meetings, including a five-and-a-half-hour classic at last year's US Open.
However, world number 24 Khachanov triumphed 6-1 6-3 in one hour 20 minutes.
He will face Greek fourth seed Stefanos Tsitsipas or Lorenzo Sonego of Italy in the second round.
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