Year IX, Artícle1], No. 104

December 11, 2019

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 "General Performance Ranking© or GPI Ranking© ".

This index considers, for its calculation, a number of aspects such as the number of played matches and won, the serves, the points won with the serves, the returns, the break points (saved and won) and the tie-breaks. Once the indexes are calculated for a given period of time, the 2019 season in this case, these indexes (not shown here) are sorted from the highest to the lowest and a ranking is established. This ranking is the General Performance Ranking© or GPI Ranking©, which is used to order players by performance in the analyzed season. As already mentioned in other articles, the WTA Ranking must not necessarily coincide with the General Performance Ranking©, in fact, this rarely happens. This General Per-formance Ranking© is very useful because it allows analyzing and quantifying the performance of an athlete in relation to the other players over a period of time.

The best performance of the season has been achieved by the Dutch Kiki Bertens (NED), making her the No. 1 in the General Performance Ranking© or GPI Ranking©of the 2019 season. The GPI Ranking© po-dium is completed by Ashley Barty (AUS) and Sofia Kenin (USA) (Table 2, p.10). Other players highlighted in the GPI Ranking© have been Belinda Bencic (SUI), Ka-rolina Pliskova (CZE), Simona Halep (ROU), Elina Svitolina (UKR), Aryna Sabalenka (BLR), Elise Mertens (BEL) and Donna Vekic (CRO) whom complete the Top 10 of the GPI Ranking©.

The following categories of tournament, which correspond to the 2019 season, have been included for the determination of the Top 150 of the General Performance Ranking© or GPI Ranking©: The tournaments have been developed on all surfaces, hard, clay and grass (In the section of Annexes the 150 players with better performance in each surface can be observed).

• Grand Slams: Australian Open, Ro-land Garrós, Wimbledon, US Open.
• Fed Cup.
• WTA International.
• WTA Premier.
• WTA 125K Series.
• WTA Elite Trophy Zhuhai.
• Shiseido WTA Finals Shenzhen.

The WTA Ranking of the players, which has been considered for this report, is on Nov 25th, 2019.
Table 1 shows the variations in the WTA Ranking and GPI Ranking© of the 150 best performing players in the 2019 season. In the Top 10 of the GPI Ranking© we observe that Sofia Kenin and Belinda Bencic have been the players who more have advanced (54 and 65 positions, respectively) with respect to the 2018 season. Other players who have had a great performance and who have advanced in the GPI Ranking© over the previ-ous season are:

• Bianca Andreescu (CAN): 236 places ↑
• Karolina Muchova (CZE): 166 places ↑
• Elena Rybakina (KAZ): 136 places ↑
• Veronika Kudermetova (RUS): 109 pla-ces↑
• Dayana Yastremska (UKR): 92 places ↑
• Yulia Putintseva (KAZ): 40 places ↑

For the rest of players, see table 1, p. 6.
This season we have 9 players from the Top 10 of the WTA Ranking in the Top 20 of the GPI Ranking©. Serena Williams is the ab-sent in this elite because with WTA Ranking 10, she only managed to be ranked 68th in the GPI Ranking©. What happens with Serena Williams is that she plays few matches, at important tournaments and achieves a high ratio of won matches over played matches, in this season her ratio was 80.6% (table 4, p. 18).

Table 5 (p. 22), Tiebreaks Performance, is an interesting table with the information of the relationship of the won tiebreaks with respect to the played tiebreaks in the season by the 150 players with the best performance. This table has been ordered according to the won tiebreaks, from highest to lowest, another sorting criterion could have been used, but this one has been chosen. This table is led by the young American Sofia Kenin (USA), followed by the Chinese Saisai Zheng (CHN) and Kiki Bertens (NED).

From the reading of the tables presented in this report, it is verified that in all of them they have been led, almost always, by the same players (Bertens, Kenin, Bencic, Pliskova, Barty, etc.). But the Dutch Kiki Bertens has had an exceptional season. In the 2018 season, Kiki Bertens had finished in 5th place of the GPI Ranking©.

Full statistical report in pdf click here

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

[2] National Tennis Coach (Argentine Tennis Association), Bachelor of Business Administration, Certified Public Accountant, Post grades of Finance Management and Capital Markets, Master of Business Administration (IAE Business School, Austral University, Buenos Aires, Argentina).


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