| Federer is a man of professional tennis.So far,he has won 20 Grand Slam singles title,ranking first among men.At the same time,he has made a world no.1 record for 237 weeks in a row.It is considered to be the greatest tennis player in the history of tennis,even beyond the legendary players such as Lavaux,Berg and Sampras.Although Federer's achievements are high,Federer's number of unforced errors soared during the 2015 season due to age,injury and other factors.Even the US Open's unforced error rate reached 22.26%.The continued decline in the competitive state of the 2016 season also resulted in Federer not winning any title in 2016.By reading relevant literature and we found that as the research continues to deepen,the study will be more and more detailed.We will pay more attention to competition details.This article evaluates Roger Federer's hard-court tennis tournament in 2017.And it based on the single indicators of unforced errors through literature review,video analytic method,technical statistics,mathematical statistics and comparative analysis.Finally,we finds that the characteristics of unforced errors in tennis matches and their influencing factors of Roger Federer's Hard Ground in 2017.Through the statistics of all the points lost in Roland Federer's six hard-court tennis matches in 2017,the characteristics and influencing factors of unforced errors in Federer are analyzed in depth.It is found that:First,after Federer came back in 2017,he gradually get rid of back problems caused by its backstroke.The batting state has been improved,tennis hitting skills and tactics have undergone great changes.No matter what parts in the basic competitive unit,Federer's initiative has become more aggressive,so the winning percentage increase is more obvious.But there are more unforced errors than the past competition what he won,but less than the past failed competitions.Second,Federer's unforced errors appear in the first few games after victory and each game after the match.The batting line is dominated by a wide slant,while the other side is mainly in midfield.This is mainly due to the adjustment of the other side after victory.The strong counterattack of opposite side made Federer must increase the attack power and angle.So that resulting in more unforced errors.Third,The limiting factor of Federer's unforced error is physical constraints,The rapid attack rhythm and the pursuit of line quality or perspective and the strength of their opponents are the main factors.,and the secondary factors are the failure use of technology and tactics and psychological fluctuations.So the unforced error happened in the first 3-6 shot,mainly in short shots.However,the important premise of victory in tennis matches is that the protection and breaking ability of professional athletes.But protect is more important than the break.Therefore,the unforced error of general athletes in the home service side is more than the unforced errors in the opposing service side.And the techniques frequently used are forward and backhand hitting in unforced errors.Fourth,the UF / W value is one of the important indexes to evaluate tennis players' hitting status.The smaller the UF / W value,the more stable the hitting status of the athletes.Therefore,maintaining the UF / W value is an important prerequisite for the athletes to win the game. |
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