Angelique Kerber of Germany hits a return to Agnieszka Radwanska of Poland during their WTA tennis championships match at Sinan Erdem Dome in Istanbul, Oct 24, 2013. [Photo/Agencies]

Eight-seeded Angelique Kerber upset No 3 Agnieszka Radwanska 6-2, 6-2 to remain in contention for the semifinals. Radwanska was eliminated.

Kerber went 0-3 last year in the tournament and this was her first win in the event. She will play Kvitova on Friday for a slot in the last four.

Kerber is 1-1 in the Red Group. Radwanska fell to 0-3.

"I'm feeling good," Kerber said. "I was really playing very well today ... I was focused from the first point."