In a week of rebounds on the WTA Rankings, it's Madison Keys who walked away with a trophy - and a four-place bump to her highest placement in over seven months.

The American came through a challenging field at the Volvo Car Open in Charleston to capture her fourth career title, including two wins over opponents who had hitherto had Keys' number: top seed Sloane Stephens in the quarterfinals and No.5 seed Caroline Wozniacki in the final, against whom she had been a combined 0-5 before this week.

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The 24-year-old's first title since Stanford 2017 has got her back on track following opening-round losses in both Indian Wells and Miami, and lifts her back into the Top 15 for the first time since last August. With little to defend over the clay season until Roland Garros, Keys can eye a potential return to the Top 10 - and even target the career-high ranking of World No.7 she set in October 2016.

Here are the notable movers in the WTA Rankings for the week commencing 8 April, 2019.

Madison Keys (+4, 18 to 14): Coming into Charleston, the American had not reached a quarterfinal since the US Open last September, and had suffered back-to-back opening losses in the March hard court swing to Mona Barthel in Indian Wells and Samantha Stosur in Miami. However, Charleston has usually been a happy hunting ground for Keys, who made the quarterfinal in 2013, the final in 2015 and the semifinal last year - and a return to green clay saw her walk away with her first title on the surface.

Petra Martic (+13, 53 to 40): The Croat also came into Charleston in need of a boost: despite hitting her career-high ranking of World No.31 at the start of the year, Martic had compiled a win-loss record of just 3-5 in 2019 before last week. But some sparkling all-court play saw the 28-year-old get past Amanda Anisimova and Belinda Bencic to make her debut in a Premier semifinal - and return to the Top 50 one month after falling out of it.

Maria Sakkari (+6, 50 to 44): Before last week, the Greek No.1 had not reached a quarterfinal since Seoul last September, where Kiki Bertens ended her run in the semifinals. In Charleston, though, Sakkari got her revenge on Bertens, ousting the defending champion for her third career Top 10 win and a spot in the last eight.

Victoria Azarenka (+7, 67 to 60): The former World No.1's comeback from maternity leave has perhaps been more arduous than many might have expected - but Azarenka was able to conjure up some sustained vintage form in Monterrey last week with superb wins over Anastasia Pavlyuchenkova and Angelique Kerber to reach her first final since Miami 2016, though the Belarusian's run sadly ended in a retirement while trailing Garbiñe Muguruza in the title round. However, one week after falling out of the Top 50, Azarenka is once again heading in the right direction.

Jessica Pegula (+7, 81 to 74): After suffering a string of injuries as she attempted to break through, the American's belated entry to the Top 100 this year has sparked a surge: Pegula scored a career-best victory over No.4 seed Anastasija Sevastova in Charleston last week, her second career Top 20 win, and hits another new career high as a result.

Laura Siegemund (+5, 104 to 99): Almost one year after Siegemund fell out of the Top 100 last April - a consequence of the knee injury that sidelined the German for 10 months between May 2017 and March 2018 - a first-round win in Charleston saw her return to that echelon this week.

Barbora Krejcikova (+69, 225 to 156): The doubles World No.2 and reigning Wimbledon and US Open doubles champion's singles career has often been stymied by a schedule that prioritizes the team discipline. But doubles took a back seat last week - and Krejcikova was able to showcase her solo skills at the ITF W80 in Palm Harbor, winning the biggest singles trophy of her career for the loss of just one set and finishing with a 6-0, 6-1 rout of Nicole Gibbs in the final. Consequently, the Czech rises back to her highest ranking since last May.

Lauren Davis (+25, 184 to 159): As recently as October, the American was ranked down at World No.264 - but continued her rebound by qualifying and reaching the second round of Charleston.

Destanee Aiava (+17, 205 to 188): The Australian hit a career high of World No.147 as a 17-year-old in September 2017, but a run of poor form has seen her stall somewhat since. However, qualifying for her first WTA main draw outside her home country in Charleston last week finds Aiava climbing to her highest ranking since last May.

Xu Shilin (+9, 206 to 197): The former junior World No.1 reached World No.202 in July 2016 as an 18-year-old, but sundry injuries have delayed her progress since. Three years later, the Chinese player has finally broken the Top 200 barrier thanks to qualifying last week in Monterrey.