Dmitry Tursunov called the main reason of instability in WTA Tura

The ex-third racket of the world, known on work and Milosh Raonich the trainer Yvan Lyubichich treated Rodger Federer, to Navratilova Martin, Pamela Howard Shrayver-Lezenbi, to Barbara Shett Igl and to Dmitry Tursunov with a question in Twitter ". How it is possible to explain it? It is very curious to me to hear opinions from the tennis world", - Yvan Lyubichich reacted to the following statistics: any of 12 finalists of the largest tournaments of last season ("Big helmets", Total and the Olympic Games) will not finish the current season in Top-10 of a rating of WTA. Thus 10 of 12 tennis-players will not get at all in Top-20. A question, in particular, answered...