Serena Williams: '' I will play calmly, almost like in training ''

American Serena Williams commented on the upcoming Wimbledon semi-final against Belarusian Victoria Azarenka. 

"She has this season better than I did. It has already achieved great success, won a Grand Slam tournament. It even seems to have the advantage. So I'm going to play quietly, almost like in training, "-said Serena Williams.