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The American was trailing Yaroslava Shvedova by a set in their third-round clash when bad light stopped play on Saturday.
After Shvedova won the first set 7-6, the players were level at 6-6 in the second set when their match was suspended.
So sorry I couldn't go out and finish the match tomorrow. Big good luck to @SlavaSays in the next round!— Madison Keys (@Madison_Keys) June 30, 2014
The world number 30 won her first WTA title earlier this month at the Aegon International at Eastbourne.