Date of Report[1]: December 8, 2018

By Rubén A. Báez[2]

Full statistical report in pdf click here

General Performance Index (GPI: General Performance Index): "It is an index that measures the performance that a tennis player has had in a given period of time." This index, not shown here, is used to make the "Performance Ranking or GPI Ranking".

This index considers, for its calculation, a series of aspects such as the number of matches played and won, the serves, the points earned with the serves, the returns, the break points (saved and won) and the tiebreaks. Once these indexes are calculated to certain period, season 2018 in this case, these indexes are ordered from highest to lowest and a ranking is established. This ranking is the Performance Ranking or GPI Ranking that is used to order the players by merit of performance in the season, in this case. As already it mentioned in other articles, the ATP Ranking necessarily not should coincide with the Performance Ranking, in fact, rarely happens. This Performance Ranking is very useful because it allows analyzing and quantifying what has been the performance of an athlete in relation to the other players.

It is often the case that a player improves his ATP Ranking and worsens his Performance Ranking and vice versa (see Table 1). Now we have two years of Performance Rankings where interesting conclusions can be getting.

Everything has an explanation when you have the data and its correct processing. The emotions, the circumstances, the environment, the importance of the matches, the intensity of the training, the coaching, the food, the weather, the time of the year, everything, absolutely everything is implicit in the statistics. Working with a huge amount of data and ordering them in a certain way, allows us to analyze and study these aspects. The ATP Ranking reflects the order of the players based on the amount of net points won or lost during a period. The higher the number of points, the better will be the ranking. In the case of the Performance Ranking, the performance in serves, returns, break points, tiebreaks, etc. are considered. Next step is calculating the general performance of the player to synthesize it in his General Performance Index or GPI. As I have already explained, the calculation of this index for each player is only the first step, the second step is to order this index (from highest to lowest) to establish the order of performance of the players. In general, as can be seen in Table 1, when a player improves or worsens his ATP Ranking, he improves or worsens the Performance Ranking. Sometimes it is not like that and there are explanations why this is happens.

The best performance of the season has been the German Alexander Zverev (GER), therefore, he is the No. 1 in the Performance Ranking of all surfaces. Excellent performance of the young player and a spectacular projection. The podium of the Performance Ranking on all surfaces is completed by Dominic Thiem (AUT) and Stefanos Tsitsipas (GRE) (Table 2, p.13). Other outstanding players in the Performance Ranking have been: Daniil Medvedev (RUS) and Kevin Anderson (RSA) on hard surfaces (Table 3, p.19), Dominic Thiem (AUT), Rafael Nadal (ESP) and Fabio Fognini (ITA) on clay surfaces (Table 4, p.25) and Roger Federer (SUI), Adrian Mannarino (FRA) and Novak Djokovic (SRB) on grass (Table 5, page 31).

We will briefly comment some interesting points. One of them is the performance of the Greek Stefanos Tsitsipas of remarkable performance this season 2018 with respect to the 2017 season. Note in Table 1, how this young player has climbed markedly, both in the ATP Ranking (↑ 76 positions) and in the Performance Ranking (↑ 126 positions). There is a lot of work and effort in these results. I extend the same comments about Tsitsipas to the next tennis player who has made a leap in quality, both in the ATP Ranking and in the GPI Ranking (Performance). I am referring to the Australian Alex de Minaur (AUS) who jumped from the ATP Ranking 208 (2017) to 31 (2018) and the Performance Ranking 158 (2017) to 31 (2018). These two young tennis players have an excellent projection.

Table 1 shows a comparative table between the 2017-2018 seasons. The ATP and GPI (Performance) rankings and their respective variations between seasons are shown. Table 1 is sorted according to the 2018 Performance Ranking. There are two small columns next to the columns of the 2018 season, the first one shows the variation in the ranking positions and the second column shows an upward arrow (↑), descending arrow (↓) or = of the respective variations of the rankings.

Before continuing, we must inform that we have changed the criteria to select the Top 150 regarding the 2017 season, so, if the following tables are compared with those of the previous season, in some players differences will arise regarding the Performance Ranking. For example, if you look at the Performance Ranking of Gael Monfils in the 2017 season in last year´s reports, Gael had a Performance Ranking of 66, and this year he is listed for the 2017 season with a Performance Ranking of 67 (Table 1), the latter is the true one. The other ranking (2017) is not wrong, only that it was calculated with another criterion. Last season we made the calculations of the Performance Rankings selecting the ATP Top 100, so these were players that without belong to the ATP Top 100 had better Performance Ranking than some ATP Top 100, for this reason, these players were not considered in the tables of Performance Ranking 2017. Those vacancies were filled by other ATP Top 100 players. On the other hand, this 2018 season the Top 150 selection was made considering the Top 150 of best performance in 2018. That is, we adopted the performance criterion to select the 150 players with the best world performance in the 2018 season, regardless of whether they are ATP Top 150. When comparing the seasons in Table 1, we had to homologate the 2017 season by recalculating it and differences have arisen in some players because of the comments above. From now onwards, we will use the performance criteria to select the Top 100, 150, 200, etc.

We also mention that we have chosen, in this 2018 season, the Top 150 instead of the Top 100, to make sure that the ATP Top 100 will be included in the Top 150 of the Performance Ranking, which has happened.

The basic data, which have been used to calculate the annual Performance Ranking (Ranking GPI), come from the official publications of the following tournaments:

a) ATP World Tour 250, 500, Masters 1000, Next Gen ATP Finals y Nitto ATP Finals.
b) Australian Open, Roland Garros, Wimbledon, US Open.
c) Davis Cup.
d) Laver Cup (Exhibition tournament).

The ATP Ranking for this report corresponds to November 26, 2018.

Full statistical report in pdf click here


Report elaboration based on data from official Websites:

 Tennis Instructor Level II (Argentine Tennis Association), Bachelor in Business Administration, Certified Public Accountant, Post grade’s degree in Finance Management and Capital Markets, MBA (IAE Business School, Austral University, Argentina).






Back »