Ashleigh Barty surged to the top of the WTA yearly standings with her third title of the year at the Porsche Tennis Grand Prix in Stuttgart.

Barty came from a set down for the third straight match to beat fifth seed Aryna Sabalenka 3-6 6-0 6-3, extending her winning run over top-ten rivals to ten successive matches.

Barty did not play a competitive match for almost a year, choosing to stay at home in Australia when the tour resumed last summer, but retained her world No 1 status due to temporary changes in the ranking system.

When Naomi Osaka followed up her US Open title by winning the Australian Open, it seemed clear the Japanese player was the de facto No 1, but Barty has set about showing she deserves her position.

The 25-year-old also won the Yarra Valley Classic in Melbourne and the Miami Open, and the Stuttgart crown – which comes with a Porsche – brought her a second title on clay after 2019's French Open triumph.

She's done it AGAIN 🏆

World No.1 🇦🇺 @ashbarty comes from a set down for the third match in a row to clinch her third WTA title of 2021!#PorscheTennis

— wta (@WTA) April 25, 2021

At the TEB BNP Paribas Tennis Championship Istanbul, Romania’s Sorana Cirstea defeated top seed Elise Mertens 6-1 7-6 (3) to win her second career title – 13 years after his first.

Cirstea, ranked 67, also triumphed in Tashkent in 2008 as an 18-year-old.

Meanwhile, world number six Bianca Andreescu has been forced to pull out of the Mutua Madrid Open after testing positive for Covid-19 on arrival in the Spanish capital.

The Canadian wrote on Twitter: "I am feeling good, I’m resting and I’m continuing to follow the health protocols and safety guidelines. I look forward to getting back out on the court very soon."