Date of Report[1]: November 19, 2018

By Rubén A. Báez[2]

Full statistical report in pdf click here


Table 1 shows the performance or Ranking GPI of all the players that have participated in the WTA Premier, Premier 5 and Premier Mandatory (21) of the 2018 season. As the first glance, it is detected that the Top 10 of the WTA Ranking is included in The Top 20 of the GPI Ranking and six players of the Top 10 of the WTA Ranking are within the TOP 10 of the GPI Ranking or Performance Ranking. Practically, the entire Top 10 of the WTA Ranking is included in the Top 10 of the GPI Ranking, except for four players: Anett Kontaveit (20), Anastasija Sevastova (11), Julia Goerges (14) and Caroline Garcia (18).

The WTA rankings are up to October 22, 2018 corresponding to the first Monday following the last WTA Premier of the season (VTB Kremlin Cup, Oct 15- 20).

Daría Kasatkina (RUS) is the player with the best performance in the WTA Premier in the 2018 season, followed by Petra Kvitova (CZE) and Karolina Pliskova (CZE) to complete the podium. The players whom winning these types of tournaments without belonging Top 10 at the time were:

Between parenthesis, the WTA ranking that the players had at the time of winning the respective tournaments.
  • Angelique Kerber, GER (14) – Sydney International (Australia, Sydney – Enero 2018)
  • Petra Kvitova, CZE (29) – St. Petersburg (Rusia, St. Petersburgo – Febrero 2018)
  • Petra Kvitova, CZE (29) – Qatar Total Open (Qatar, Doha – Febrero 2018)
  • Naomi Osaka, JPN (44) – BNP Paribas Open (EE.UU., Indian Wells – Marzo 2018)
  • Sloane Stephens, USA (12) – Miami Open (EE.UU., Miami – Marzo 2018)
  • Kiki Bertens, NED (27) – Volvo Car Open (EE.UU., Charleston – Abril 2018)
  • Mihaela Buzarnescu, ROU (24) – Mubadala Silicon Valley Classic (EE.UU., San José – Agosto 2018)
  • Kiki Bertens, NED (17) – Western & Southern Open (EE.UU., Cincinnati – Agosto 2018)
  • Aryna Sabalenka, BLR (25) – Connecticut Open (EE.UU., New Haven – Agosto 2018)
  • Aryna Sabalenka, BLR (20) – Dongfeng Motor Wuhan Open (China, Wuhan – Septiembre 2018)
  • Daria Kasatkina, RUS (14) – VTB Kremlin Cup (Rusia, Moscú – Octubre 2018)
For those who have not read my previous articles, I comment that for the calculation of the "GPI Ranking or Performance Ranking" several parameters are considered such as services, returns, break points, tiebreaks, the ratio between matches won respect the total played matches by each player. The result of those calculations gives an index of performance that I have called GPI (General Performance Index) or General Performance Index. These GPI indexes are sorted in descending order and that order is what I have called GPI Ranking or Performance Ranking. This is to obtain the most reliable measurement possible of a player´s performance along a period of time. This GPI Ranking takes into account the performance regardless of the number of points distributed by each category of tournaments. On the other hand, the ATP Ranking takes into account the amount of points won in a period of time and does take into account the number of points distributed per type of tournament. In general, Top players who have a high performance along a period have a high GPI Ranking and ATP Ranking too. This will be better when I will soon present the GPI Ranking of the entire 2018 season with all the tournaments (WTA, Grand Slam, Fed Cup). The GPI Ranking is also calculated for each type of surface (Hard, clay, grass).


Full statistical report in pdf click here



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

[2] 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).








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