Ana Ivanovic's frustrating run continued on Monday as she became the first major casualty of the U.S. Open.
Since her semifinal appearance at the French Open, the world No. 7 has only won five matches on the WTA Tour, and Monday's 6-3, 3-6, 6-3 defeat at the hands of Dominika Cibulkova is another major disappointment.
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Her first-round major exit is the second of 2015 after suffering the same fate at the Australian Open. She was beaten in round two at Wimbledon.
The seventh seed made a confident start at Flushing Meadows but she failed to capitalize on a break in the fifth game as she promptly lost four successive games to give Cibulkova the set.
Ivanovic bounced back in the second, though, and came from 3-1 down to win five in a row to level the match.
She failed to use that momentum though as she was broken twice at the start of the decider, Cibulkova — who had fallen at the first round at the last two U.S. Open tournaments — showing her fight to cruise through.
There was a brief glimmer for the Serb in the seventh game but Cibulkova, who reached the Australian Open final this year, held her nerve and booked a second-round place.