Perth: Agnieszka Radwanska led Poland to a win over the United States on Saturday, in their first victory at the mixed teams Hopman Cup in Australia The world number five teamed with Hopman debutant Jerzy Janowicz to beat the US pairing of Serena Williams and John Isner 2-1.
Radwanska set up the win when she stunned a feisty Williams in the women's singles tie that opened the final, beating the world number one for the first time in nine meetings.
Isner then levelled with a straight-sets win over Janowicz, before the Poles clinched the title in mixed doubles encounter.
It was a difficult night for Williams, who was aiming to become the first player to win three Hopman Cup titles.
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