I think a lot of is their coaches trying to figure out their strengths. Similar to Jankovic, who was aggressive until 2008. They started to be retrievers only to focus on one part of their game, unfortunately.

@@KO-vv1oz This is so true. Wozniacki and Jankovic were such great counterpunchers, and both of them were much more agressive : hitting down the line backhands when they could, and hitting the forehand with more purpose. This also accounts for Radwanska, when her craftiness was exploited, but she didn't want to work on bringing more power to her game or improving her serve.