Elise Mertens and Laura Siegemund headline the list of the WTA's biggest ranking movers of the week.
WTA Staff

With the European clay court season beginning in earnest in Stuttgart and Istanbul last week, the WTA Rankings saw its fair share of movement thanks to standout performances at both the TEB BNP Paribas Istanbul Cup and the Porsche Tennis Grand Prix.

Simona Halep, a semifinalist in Stuttgart, moves back to World No.4, while Istanbul champion Elina Svitolina rises one spot to No.12. To cap the notable movers in the top 20, Stuttgart runner-up Kristina Mladenovic rises two spots to cement her place at No.17.

Here are the other biggest movers around the WTA Rankings over the past week:

Laura Siegemund (+19, 49 to 30): The German is back in the WTA top 30 after a stunning run to win the Porsche Tennis Grand Prix in Stuttgart, as she defeated three top 10 players in five matches. The 29-year-old reached her best career ranking of World No.27 last August.

Elise Mertens (+12, 65 to 53):  The Belgian reached her second career WTA final in Istanbul where she fell to Elina Svitolina, but her breakthrough 2017 now sees her on the brink of entering the top 50 for the first time.

Jana Cepelova (+12, 97 to 85): A semifinal showing in Istanbul, her best since the Tokyo Internation event last fall, sees the Slovak rise 12 spots in the rankings.

Maria Sharapova (unranked to 262): The five-time Grand Slam champion returns to the WTA Rankings this week after reaching the semifinals in Stuttgart. The last time Sharapova appeared in the WTA Rankings was the week of October 17, 2016 (at No.91).

It's been nearly eight years since the Russian had an official WTA Ranking outside the Top 100, having been ranked No.102 for the weeks of May 25, 2009 during the 2009 French Open. The event was just her second after returning from a right shoulder injury, which forced her to miss nine months of action.

Dayana Yastremska (+111, 420 to 309): The 16-year-old made a splash in her third-career WTA main draw in Istanbul, defeating No.8 seed Andrea Petkovic for her first WTA win en route to the quarterfinals. 

After defeating Garbiñe Muguruza and reaching the quarterfinals in Stuttgart as a qualifier, Anett Kontaveit rose eight spots to a career-high No.65. Also reaching new career highs this week are: Mertens, Mladenovic and Mirjana Lucic-Baroni (No.20).