Simona Halep finished just short of a first Grand Slam title at Roland Garros, but it was still a stunning clay court swing for the Romanian, who kickstered her season and re-affirmed her status as one of the best players on the terre battue.
Reaching the semifinals at the Porsche Tennis Grand Prix, winning the Mutua Madrid Open, and finishing runner-up at the Internazionali BNL d'Italia, Halep earned wins over Elina Svitolina and Karolina Pliskova en route to the championship match in Paris.
The major result added over 1000 points to her clay court index and helped her finish atop the WTA Insider Clay Court Power Rankings - ahead of last year's No.1 and 2015 champion, Serena Williams, who skipped the clay court season due to her pregnancy.
Rounding out the Top 10 is Roland Garros winner Jelena Ostapenko, who bookended her clay court season with final appearances at the Volvo Car Open and Paris, where she survived three-set thrillers against Samantha Stosur, Caroline Wozniacki, and Timea Bacsinszky before outlasting Halep not only for her first Slam, but also her first WTA title.
The WTA Insider Clay Court Power Rankings is based on an empirical formula that isolates a player's success rate on clay. To measure a player's recent aptitude on the surface, the Insider team applied the following formula:
100% of points earned on clay in 2017
100% of points earned on clay in 2016
75% of points earned on clay in 2015
50% of points earned on clay in 2014
The resulting sum accounts for a player's "Clay Index." For the previous rankings run, click here.
As of the week of June 12, here are the final Top 10 for the 2017 clay court season: