The Analysis Of Li Na’s Technical And Tactical Change Features Under The Tutelage Of Carlos Before And After

The technical level of Li Na in the Chinese women "Four Golden Flower" is the highest, but also in the top ten ranking in WTA. However, Li Na’s occupation career, in 2011 after the French, Li Na grades suffer a disastrous decline, after a year in performance plummeting, Li Na said in the interview even wanted to retire. The reason is that Li Na’s psychological quality but hard, not to adapt themselves in women’s tennis super class status, it is the face of the key points in the game when not confident, "collapse" phenomenon. In a coach, through the knowledge of psychology of Carlos’ s powerful and rich technical and tactical coaching experience guidance, This paper from a tactical point of view, to explore the technical and tactical characteristics of Carlos Li Na from the changes before and after.In this study, 12 games to Li Na in 2011- 2013 WTA finals and the 2014 Australian Open tennis tournament as the research object, use the research methods of literature, expert interviews, videotape analysis, bibliometric method and mathematical statistics and so on, to Li Na under the tutelage of Carlos before and after service technique, serving tactics, connection serving tactics, aggress stage, meets serves assaults stage and stalemate tactics research, thus obtains Li Na studied the technical and tactical change characteristics of Carlos, the results of the study show that:1) Li Na serve technology has a great change in the studied under Carlos, the specific performance: the preparation phase legs can shorten the distance between the center of gravity, dropped to the lowest point lower than before, more conducive to the force, action structure more consistent with human engineering. Serving technique the whole action time than before more short, the entire service action more fluent.(2) Li Na serve a round of score rate is greatly increase, more tricky in the face of the key points of the service placement, often with a meter Ace ball or serve scoring a direct dangerous situation. In serves assaults stage especially the third shot placement is more reasonable, the most obvious change is to make full use of the body center of gravity to expand the hitting angle.(3) receiving capability is more comprehensive, sending and receiving of score rate and break the scoring rate is more stable, the placement receiving performance for linear > slash > Road, and to increase the attack power while guaranteeing stability, conversion of offensive and defensive role in the fourth and the Stalemate Stage in order to facilitate the.(4) changed three scoring Li Na, stalemate scoring than before the proportion reduced, more score occurred attack stage and receive attack stage in the service.(5) change the playing style. Li Na in under the tutelage of Carlos before the attack line is a typical stalemate type player, in under the tutelage of Carlos after Li Na backhand balance and aggressive drive technology with fast feet moving ability, plus the net technology is a solid, comprehensive type player its transition from baseline players.