Tokyo, Japan (Sports Network) - Defending champion Agnieszka Radwanska of Poland and Russian Nadia Petrova each earned straight-set victories in their semifinal matchups at the Pan Pacific Open on Friday.

The third-seeded Radwanska, who defeated Vera Zvonareva in last year's final, made quick work of Angelique Kerber, ousting the fifth-seeded German 6-1, 6-1 in just 59 minutes.

Radwanska will be looking to capture her 11th career WTA title and fourth this year when she faces off with Petrova, who smashed nine aces and saved all three of her break point opportunities en route to a 6-4, 6-2 triumph over eighth-seeded Australian Samantha Stosur.

The 17th-seeded Russian improved to 6-3 lifetime against Stosur, who knocked off second-seeded Maria Sharapova on Thursday.

Petrova will be vying for her 12th career WTA title and second in 2012. She is 1-3 against Radwanska in her career, including a setback in the final at Eastbourne in 2008.

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