The world No. 1 was thrown off by Siegemund's changes in pace and rhythm, but came through in three tight, tense sets.

Aryna Sabalenka avoided creating another Wimbledon upset with a narrow three-set victory over unseeded Laura Siegemund to book her place in the semi-finals.

Aryna Sabalenka was dragged into a bygone era on Tuesday and tormented for almost three hours on Wimbledon’s Centre Court before finally imposing her 21st-century power game to beat mesmeric Laura Siegemund for a place in the semi-finals.