World number one Aryna Sabalenka narrowly avoided a seismic shock as she fought back to beat veteran Laura Siegemund and claw her way into the Wimbledon semi-finals.

The Belarusian, the heavy favourite for the title, had to twice come back from a break down in the deciding set to beat the 37-year-old German 4-6 6-2 6-4.

Sabalenka has reached the final of the past three majors and, with most of her rivals falling in the first week of SW19, she has an incredible chance of reaching Saturday’s showpiece.

But few would have predicted the almighty scare that Siegemund – who had previously never gone beyond the second round in singles here – came within touching distance of completing.

Siegemund, more noted for her doubles prowess, drove Sabalenka to distraction with her slices, brilliant returning and generally slow pace of play.

It took all of Sabalenka’s grit and determination to hang in and eventually advance after two hours and 54 minutes.

“After the first set I was looking at my box and thinking, ‘book the tickets, we are about to leave’,” Sabalenka said afterwards.

“I had to make sure I didn’t show I was annoyed by her – even if I was slightly, I didn’t want to give her that energy.”

Siegemund will face either 13th seed Amanda Anisimova or Russian Anastasia Pavlyuchenkova for a place in a first Wimbledon singles final.