Construction And Application Of Evaluation Model Of Technique And Tactics Of Elite Men's Singles Tennis Players In Three Kinds Of Courts

In competitive tennis theory and practice,constructing outstanding men's singles players' technique and tactics evaluation model in the different fields,and on the basis of comparing the outstanding men's singles players' technique and tactics evaluation are the important way to improve the athlete targeted training and scientific competition.By applying mathematical statistical methods such as literature review,expert interview,video analysis,rank sum test,grey correlation,entropy value etc.,this paper establishes an evaluation model and evaluation criteria of the outstanding men's singles tennis players' techniques and tactics in hard court,red clay court and grass court from six dimensions,namely,including the ball route,placement,and point,game,set and field competition process.At the same time,this paper compares the technical and tactical evaluation indexes in the six evaluation dimensions when outstanding men's singles tennis players play on different courts,finds out the similarities and differences in the technical and tactical application of outstanding men's singles tennis players in different courts,and uses this model to objectively and accurately analyze and evaluate the technical and tactical performance of Chinese and overseas outstanding men's singles tennis players in different courts.The main conclusions are as follows:(1)There are two key success factors in hard court techniques and tactics,namely,serving performance(1st serve won and 2st serve won)and sending and receiving the technical performance(receiving points won);There are three key success factors in red clay court's techniques and tactics,namely serving performance(1st serve won),sending and receiving the technical performance(receiving points won)and batting efficiency performance(ratio of winner to unforced errors);There are three key success factors in the technique and tactics of the grass court,namely,serving performance(2stserve won),sending and receiving the technical performance(receiving points won)and net shot index(net point won).(2)Grey correlation method and entropy value method can accurately calculate the weight of each scoring rate evaluation index in the four stages of the ball route,placement and point competition process,thus ranking the influence of each scoring rate evaluation index in each dimension on the competition results.(3)In the placement dimension: the L3 area scoring rate and R3 area scoring rate of hard court and red clay court have the greatest influence on the competition result,while the R3 area scoring rate of grass court has the greatest influence on the competition result,and L3 area scoring rate ranks second;there are significant differences between at least two kinds of courts in the evaluation indexes of the utilization rate of the middle and front fields in the right area,the scoring rate of the middle and front fields in the left area,the scoring rate of the back fields in the left area,the scoring rate of the back fields in the right area,the technical feedback of the middle and front fields in the right area and the technical feedback of the back fields in the right area.In the dimension of ball routes:the improvement of scoring rate of backhand line shot and forehand crosscourt shot in hard court,the improvement of scoring rate of backhand line shot in red clay court and the improvement of scoring rate of backhandcrosscourt shot in grass court have more important influence on the improvement of techniques and tactics and the outcome of the match,there are significant differences between at least two kinds of courts in 6 ball route utilization rate,forehand side scoring rate,backhand side scoring rate,forehand side and backhand side technical feedback evaluation indexes of the three courts In the point dimension of competition process,the scoring rate in the service receiving section and the scoring rate in the service receiving section of hard court have the greatest influence on the competition result,the scoring rate in the clay court and the scoring rate in the service receiving section have the greatest influence on the competition result,and the scoring rate in the grasscourt and the scoring rate in the service receiving section have the greatest influence on the competition result,there are significant differences between at least two kinds of courts in the four-stage utilization rate,the scoring rate in the service section,the scoring rate in the two-stage stalemate,the technical feedback in the service section and the technical feedback evaluation index in the service receiving section.In the game dimension of competition process:for different courts,the serving and receiving innings have the same effect on the competition results,there is no significant difference in the z-value of serving and the z-value of receiving service between different courts.In the set dimension of competition process:there is no significant difference in the set z-value between different courts.In the match dimension of competition process: the score rate of receiving service is always the key technical and tactical performance index that has the greatest influence on the competition results,while the indexes ranked second and third are different,the scoring rate of receiving service for excellent men's singles tennis players in hard court,red clay court and grass court is significantly different,and the pointwon of first serve for tennis players in hard court and red clay court is significantly different due to the different courts,but the pointwon of second serve for tennis players in hard court and grasscourt is not significantly different.(4)The technical and tactical level evaluation of Wu Yi-min's hard court,Djokovic's red clay court and Simon's grass court proves that the evaluation index and standard can make a certain contribution to the scientific evaluation of athletes' technical and tactical level in the competition.