YULIA PUTINSEVA

Off the court, Moscow-born Yulia Putintseva is an enigma. On the court, every thought and emotion is writ large for the world to see. If the 26-year-old is pleased, you will hear it. If she is not, you will see it. A three-time Slam quarterfinalist with a career-high ranking of No.27, the mercurial Kazakh's matches never fail to entertain.