However, offensive baseliners can often excel on both grass and clay courts as well. On grass, they can execute their "winners" and the fast, low bounce makes it harder for opponents to retrieve; whereas on clay courts, some offensive baseliners might like the slow and high bounce because it gives them a longer time to change their grip and foot-positions in order to set up for an offensive shot or winner. Offensive baseliners with height especially have an advantage on clay courts because the high bounces land in their hitting zones, allowing them to strike the ball cleanly and more powerfully. One great example for this is Maria Sharapova, who is 6'2", and the high bounce of the ball really helps her produce winners and force errors from her opponents. She had the hardest hit backhand at the 2013 French Open from the women's side, when she punished a first serve from Jelena Jankovic, producing a backhand return winner. Ivan Lendl was the first player to popularize this style of playing in modern era professional tennis. Steffi Graf and Monica Seles were the pioneers on the women's side. Serena Williams is also known for excelling with this style. Rafael Nadal is accomplished at an offensive baseline playstyle, using a variety of high-spin shots and powerful flat strokes to dominate play, most notably on clay, which he is known to be very good at (though he usually prefers to play a defensive baseline style). Novak Djokovic is also a notable aggressive baseliner, with his powerful and precise backhand which is widely regarded as the best backhand of any active player. A defensive baseliner, "counter-puncher" or "retriever", tries to return every ball and relies on the opponent making mistakes. The trademarks of a counterpuncher include consistent shots with low error rate, as well as precise placement that makes it hard for their opponent to execute an aggressive shot. Counterpunchers also have a tendency to anticipate and are usually equipped with extremely good passing shots, thus enabling them to turn lots of defensive situations into offence. The game of the defensive counter-puncher has more to do with physical endurance and willingness to get every ball back in play as well as mental determination to keep from getting bored or trying for too much. Their game plan often involves moving their opponents back to the court and outmaneuvering their opponents. One example is former world number one Caroline Wozniacki who moves her opponent around the court without going for high risk winners.