Naomi Osaka qualifies for the Stuttgart Open semis

World number one Naomi Osaka battled back from 1-5 down in the final set to beat Donna Vekic 6-3, 4-6, 7-6 (7/4) on Friday to reach her first career clay court semi-final in Stuttgart.

“I just told myself I didn’t want to come away from here with any regrets,” said 21-year-old Osaka. She added that she was “stressed out” and “making excuses” before managing to turn the tables on Croatia’s Vekic.

The dramatic comeback saw Osaka reach her first ever clay court semi-final, where she will face Estonia’s Anett Kontaveit on Saturday.

The match will also be Osaka’s first semi-final since winning the Australian Open in January, having suffered early exits in Dubai, Indian Wells and Miami.

Osaka cannot lose her number one spot in Stuttgart, but she will be looking to keep a healthy points lead over world number three Petra Kvitova, who also won her quarter-final on Friday.

Kvitova overcame a rocky start to beat Latvia’s Anastasija Sevastova 2-6, 6-2, 6-3. “It was really difficult today, but I am very happy to be in the semi-final. I feel good and healthy,” said Kvitova.

She will face the Netherlands’ Kiki Bertens.