Caroline Wozniacki progresses in Istanbul; Angelique Kerber woe

Michael Graham
STUTTGART, GERMANY - APRIL 26: Angelique Kerber of Germany reacts during her match against Anett Kontaveit of Estonia during day 4 of the Porsche Tennis Grand Prix at Porsche-Arena on April 26, 2018 in Stuttgart, Germany. (Photo by Alex Grimm/Getty Images)

Caroline Wozniacki is into the quarter-finals in Istanbul, but she was made to work hard for it by Sara Errani.

The world number two needed three sets and nearly two-and-a-half hours to overcome Italian Errani 5-7 6-3 6-3.

The Italian had 12 break points in the first set before eventually clinching it, but Wozniacki found her game from there-on to control the rest of the match.

Wozniacki will now play Frenchwoman Pauline Parmentier in the last eight.

They’ll be joined in the quarter-finals by Maria Sakkari, Arantxa Rus, Polona Hercog, and Donna Vekic.

Meanwhile, the big news from Stuttgart was Angelique Kerber’s retirement against Estonia’s Anett Kontaveit.

The home-crowd favourite was 5-0 down in the first set inside just 17 minutes before getting some off-court treatment. She was unable to recover and decided enough was enough when 2-0 down in the second.