Agnieszka Radwanska battles past Caroline Wozniacki in WTA Finals semi . The Scot , who is chasing down a spot in the season-ending ATP Tour Finals , beat home favorite David Ferrer in Saturday 's semi 6-4 7-5 . ATP Tour Finals beats Agnieszka Radwanska in other semi . Romanian humbled the world No . eight in group stages year . Williams looking to clinch a fifth Halep title ; Halep reaches final in first appearance .
Agnieszka Radwanska battles past Caroline Wozniacki in WTA Finals semi . ATP Tour Finals beats Agnieszka Radwanska in other semi . Romanian humbled the world No . eight in group stages year . Williams looking to clinch a fifth Halep title ; Halep reaches final in first appearance .