| Novak Djokovic,born on May 22,1987,is currently ranked sixth in the ATP men's singles world rankings(up to July 7,2008).Top.1 ranked 223 weeks in office,second only to Federer's 310 weeks in active service.Since his debut,he has won 13 grand slams,31 masters,5 year-end championships and 70 singles titles.Beating Federer in the final of the Cincinnati masters became the first "master king" to win four grand slams,year-end tournaments and all nine masters titles.During the period of 2011-2016,Djokovic was in the best stable state of competition.After winning the French open championship in 2016,Djokovic had been in an unstable state.Due to injury and other factors,Djokovic dropped to the TOP 12 on November 6,2017.At the beginning of 2018,the Australian open chose to make a comeback,gradually catching up with the TOP 6 at present from the bottom 22,and the competitive status was obviously improved.In terms of competition type,the fluctuation of hard-court competition is the main reason for the great change of record.This paper through the literature material law,video observation,mathematical statistics,comparative analysis and other research methods to Djokovic form in different periods of2011-2018 hard tactics of singles were analyzed,and find out the advantages and disadvantages of tactics and competitive state fluctuations,delve into Djokovic technique features change law itself over time,the following conclusions:1.Based on the fluctuation of Djokovic's competitive status in time and the most direct reflection of his performance and ranking,the combined performance of different competitive status in 2011-2018 is divided into three stages: 2011-2016 is the best competitive period of high level,2016-2017 trough period,and 2018 comeback period.2.On the overall use tactics,highest utilization rate of djokovic stalemate,belong to the bottom line game players,in terms of scoring ability,receiving phase is smooth,serve and stalemate with competitive state changes,due to the variation of phase and the trough serving stalemate score is low,it can be seen that the serve ability and the ability of the American change is the main cause of competitive state fluctuations.3.In terms of serving ability,the average speed of one serve is gradually reduced.The average speed of the two rounds is higher than that of the best period during the comeback period.It is higher in the best period of the second round and the return period.It is "concave" in the stability of the serve.type change;Due to changes in technique and tactics,the aggressiveness of serving changes.In the best period,the offense of serving is strong and the stability is weak,and it is mainly based on the flat shot.The serve angle is based on the choice of attacking opponent's backhand position.To a certain extent,the ball speed and explosive force are pursued to win the ball;In the low period,the stability of the two rounds has been enhanced,but the stability of the first round has dropped significantly,and the ability to serve and score has been weakened.The main choice of angles is mainly based on the big angle,and the advantage of serving is not obvious.During the comeback period,the stability was enhanced,the rotation mode was diversified,the ball speed,angle,rotation were changeable,and the serve motion was more compact and smooth.From the single-type attack mode dominated by speed,it was transformed into a combination of rotation,angle,and depth multiple attacks.4.In terms of receiving and serving,the winning rate of receiving and serving fluctuates with the state of competition,but the change is relatively small;The winning rate of the receiving game is the highest in the best period,and the stateof the latter two periods fluctuates.On receiving ways and routes,mainly adopts sides smoke ball,on the second case,the cutting spin technology use gradually increased,in relatively backhand forehand hair flat partition is more,on the route choice,mainly the middle diagonal lines there is a certain proportion,area in hand smoke ball backhand forehand relatively more,in proportion to the receiver route slash increased,it can be seen that hand position is backhand and no obvious disadvantages,receiving not affect djokovic,the cause of the fluctuation of form.5.In the stalemate stage,the comprehensive use of various technologies is gradually increasing.From the defensive counterattack style of play to the attacking and defending style of play,the stability of the forehand and backhand stroke ability fluctuates to a certain extent.In terms of winning points,the scoring ability of forehand side attack changes with the competitive state.The scoring area is gradually expanded from the initial baseline to the center and front field,and the forehand and backhand shooting ability is gradually balanced.The technical improvement causes the stability fluctuation,which is an important reason for the fluctuation of the competitive state.6.In the tactical combination,the use of cutting technology from passive to active,more and more refined technology,from the focus of the baseline sawing attack opponent backhand position,gradually transformed into a combination of technology,Angle,depth,speed,rotation,increase the effective use of the site,attack mode is more variable. |
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