Pennetta was at the peak of her power after staging a surprising turnaround to world number one Caroline Wozniacki in the quarterfinal on Friday. But Radwanska has won two of the last three meetings between the players.
Although Radwanska lost her serve in the first game of the first set, the Polish girl quickly showed her strength in the second and forth to break, with the score up to 3-1. Then the world No12 was in full possession of the following games to win the first set 6-2.
Radwanska gained a total of five breaks in the whole match, which guaranteed she can still take an advantage of Pennetta in the second set. With the Italian's return ball flying out-of-bounds, the playing time has framed in 1 hour 23 minute.
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