World No.2 Petra Kvitova soars up the WTA Insider Clay Court Power Rankings after capturing the Porsche Tennis Grand Prix, her third clay title in the last 12 months. See how the rest of the field stacks up ahead of the Madrid Open.
WTA Insider Courtney Nguyen
May 1, 2019

World No.2 Petra Kvitova has shot up the WTA Insider Clay Court Power Rankings after her strong run to her first Porsche Tennis Grand Prix title. The Czech went into Stuttgart ranked No.10 on the Clay Court Power Rankings, but with her third clay title in the last 12 months, Kvitova now sits at No.4.

Kvitova's Stuttgart challenger in the final, World No.15 Anett Kontaveit, also made a significant move after yet another strong clay run. The Estonian debuts at No.10 on the Power Rankings, after proving herself year after year on the terre battue. 

Click here for the most recent run of the Power Rankings and click here to see where the rankings stood at the start of the clay season.

The WTA Insider Clay Court Power Index is based on an empirical formula that isolates a player's success rate on clay courts. To measure a player's recent aptitude on the surface, the Insider team applied the following formula, which takes into account a player's results over the last four seasons:

100% of points earned on clay courts in 2019
75% of points earned on clay courts in 2018
50% of points earned on clay courts in 2017
25% of points earned on clay courts in 2016

The resulting sum accounts for a player's "Clay Court Index."

Note that the Power Index formula has been adjusted in 2019. In previous years, 100% of the points earned from the current season and previous season were taken into account. In order to provide a more accurate reflection of recent form, the revised formula takes 100% of the points from the current season and 75% of the previous season.

Here are 2019's clay court champions so far:

Stuttgart: Petra Kvitova d. Anett Kontaveit
Charleston: Madison Keys d. Caroline Wozniacki
Bogota: Amanda Anisimova d. Astra Sharma
Lugano: Polona Hercog d. Iga Swiatek
Istanbul: Petra Martic d. Marketa Vondrousova

The Top 20 on the WTA Insider Clay Court Power Rankings, as of April 29th:

No.1 Simona Halep (WTA Rank: No.3)
Career Clay Court Win %: 72.5%
2019 Clay Court Record: 2-0 (both wins in Fed Cup)
Notable recent clay court results: 2018 Roland Garros champion, 2018 Rome finalist, 2018 Madrid semifinalist, 2017 Roland Garros finalist, 2017 and 2016 Madrid champion, 2017 Rome finalist, 2016 Roland Garros Round of 16.

No.2 Kiki Bertens (WTA Rank: No.7)
Career Clay Court Win %: 69.0%
2019 Clay Court Record: 
Notable recent clay court results: 2019 Stuttgart semifinalist, 2018 Madrid finalist, 2018 Charleston champion, 2017 Gstaad champion, 2017 and 2016 Nuremberg champion, 2016 Gstaad finalist.

No.3 Elina Svitolina (WTA Rank: No.6)
Career Clay Court Win %:65.1%
2019 Clay Court Record: DNP
Notable recent clay court results: 2018 and 2017 Rome champion, 2017 Roland Garros quarterfinalist, 2017 Istanbul champion, 2016 Roland Garros Round of 16.

No.4 Petra Kvitova (WTA Rank: No.2)
Career Clay Court Win %: 66.4%
2019 Clay Court Record: 4-0 
Notable recent clay court results: 2019 Stuttgart champion, 2018 Madrid champion, 2018 Prague champion, 2016 Stuttgart semifinalist.

Champions Corner: Petra Kvitova races away in Stuttgart

No.5 Garbiñe Muguruza (WTA Rank: No.20)
Career Clay Court Win %: 64.9%
2019 Clay Court Record: DNP
Notable recent clay court results: 2018 Roland Garros semifinalist, 2016 Roland Garros champion, 2017 and 2016 Rome semifinalist, 2017 Roland Garros Round of 16. 

No.6 Jelena Ostapenko (WTA Rank: No.31)
Career Clay Court Win %: 62.2%
2019 Clay Court Record: 2-3
Notable recent clay court results: 2018 Rome quarterfinalist, 2017 Roland Garros champion, 2017 Charleston finalist, 2017 Prague semifinalist.

No.7 Madison Keys (WTA Rank: No.14)
Career Clay Court Win %: 64.9%
2019 Clay Court Record: 4-0
Notable recent clay court results: 2019 Charleston Champion, 2018 Roland Garros semifinalist, 2018 Charleston semifinalist, 2016 Roland Garros Round of 16, 2016 Rome finalist. 

No.8 Sloane Stephens (WTA Rank: No.8)
Career Clay Court Win %: 59.6%
2019 Clay Court Record: 1-1
Notable recent clay court results: 2018 Roland Garros finalist, 2016 Charleston Champion.

No.9 Karolina Pliskova (WTA Rank: No.4)
Career Clay Court Win %: 57.7%
2019 Clay Court Record: 0-1
Notable recent clay court results: 2018 Stuttgart champion, 2018 Madrid semifinalist, 2017 Roland Garros semifinalist, 2017 Rome quarterfinalist.

No.10 Anett Kontaveit (WTA Rank: No.15)
Career Clay Court Win %: 60.0%
2019 Clay Court Record: 3-1
Notable recent clay court results: 2019 Stuttgart final, 2018 Roland Garros Round of 16, 2018 Rome semifinals, 2018 Stuttgart semifinals, 2017 Rome Quarterfinals.

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