Caroline Wozniacki has fought her way back from a set down against Petra Kvitova to seal her place in the quarter-finals of the Cincinnati Open.
The Dane was twice broken as she lost the first set 6-3, but the Czech seventh seed could not maintain that momentum.
Wozniacki put immense pressure on Kvitova's serve, breaking five times on her way to taking the next two sets 6-2 6-3.
The 23-year-old will face Victoria Azarenka - 6-3 6-4 winner over Magdalena Rybarikova - for a place in the last four.
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