Date of Report[1]: March 25th, 2018

By Rubén A. Báez[2]

Full statistical report in pdf click here

For the annual and monthly determination of the GPI (General Performance Index) it is considered the "total number of players who have participated in the 2018 season" or in the corresponding analysis period, regardless of whether this report only exposes the Top 30 of the WTA ranking. That is, the GPI has been calculated for all the players who have played so far in the 2018 season, but only the Top 30 are exposed. I make this clarification because the GPI of a tennis player is related to the GPIs of all the players of the total population that was considered for the calculations. And from that statistical population I only expose the Top 30.

The statistics used to calculate the annual General Performance Index (GPI)3 come from:

a) Tournaments WTA International, Premier, Premier Mandatory, 125K Series, Elite Trophy Zhuhai, BNP Paribas WTA Finals Singapore.

b) Australian Open, Roland Garros, Wimbledon, US Open.

c) Fed Cup.

So far in the 2018 season, the German Angelique Kerber is the tennis player with the best General Performance Index (GPI = 194,69), which is why, according to our studies, she is ranked No. 1 in the GPI ranking.

As has already been explained in previous reports, the GPI calculation is carried out considering the performance of certain variables (Services, returns, break points, etc.). In this way, for each variable a GPI is calculated and then a Total GPI contemplates all the GPIs of those variables, determining the general performance of the player.

It is like an academic average; the general average of a student is the average of the averages of the different subjects. Each subject has its average. In such a way that a tennis player will be able to perform better in the service, but not as well in the return, as an example. Those that are more regular and outstanding in the performance of the different variables will obtain a higher General Performance Index, consequently, they will have a better GPI ranking or performance ranking.

In the case of Angelique Kerber, she has been highlighted in (in parenthesis the GPI ranking):

•General Performance Index or GPI (1)

•Performance of the 1st Serve “in” [%] (1)

•Performance of the 2nd Serve ‘in” [%] (1)

•Performance of the 1st Service Won (1)

•Performance of the 2nd Service Won (1)

•Performance of the Break Points Saved (1)

•Performance of the Break Points Won (1)

•Performance of the 1st Return Points Won (1)

•Performance of the 2nd Return Points Won (1)

It can be observed that, in the performance of the different evaluated aspects, Kerber has achieved the first position in all aspects that we consider. She began the year with a WTA ranking No. 22 and up to the date of this report she is within the select Top 10 again with the WTA ranking No. 10. In this season she played 22 matches and won 18. For that reason, her performance has been outstanding so far for what corresponds to the deserved position No. 1 in the GPI ranking. Other highlighted tennis players for the 2018 season are: Caroline Wozniacki, Simona Halep, Daria Kasatkina, Elina Svitolina, Julia Goerges and Naomi Osaka.

Full statistical report in pdf click here 

[1] Report elaboration based on data from official Websites:

[2] Tennis Instructor, Buenos Aires), Bachelor in Business Administration, Public Accountant, Post grade’s degree in Finance Management and Capital Markets, MBA (IAE Business School, Austral University, Argentina).



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