Lepchenko upsets defending champ Radwanska at Korea Open

Varvara Lepchenko defeated Agnieszka Radwanska to reach the Korea Open semifinals.

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Fifth-seeded Varvara Lepchenko of the United States upset defending champion Agnieszka Radwanska 6-7 (4), 6-2, 6-2 in the Korea Open quarterfinals on Friday.

Lepchenko converted three of four break points in the third set to oust the top seed. Lepchenko has beaten Radwanska twice this year, after losing five straight.

Resurgent Maria Kirilenko of Russia also reached the semifinals with a 6-7 (3), 6-2, 6-3 win over sixth-seeded Kaia Kanepi of Estonia. Kirilenko fell out of the top 100 this year after a knee injury kept her out of the first three months of the season.

Her first semifinal in 17 months will be against second-seeded Karolina Pliskova of the Czech Republic, who beat qualifier Nicole Gibbs of the United States 6-3, 6-4.