Pegula stuns top seed Swiatek to make US Open semis

Czech Karolina Muchova overcame illness to reach her second consecutive US Open semi-final with a 6-1 6-4 win over Beatriz Haddad Maia.

Muchova, who only returned to action in June after having wrist surgery, first left the court after wrapping up the first set with ease.

The unseeded 28-year-old then ran off court at 2-1 and again at 3-2 in the second and was seen by the doctor and physio at 4-3.

"It was a weird match," said Muchova. "I had some problems I don't want to comment on but I had to keep running to the bathroom and back.

"Sorry if it disturbed anyone but I had no other choice."

Haddad Maia also had problems and seemed to be in tears before receiving treatment from the doctor at 5-3 down in the second set.

Muchova, who lost to eventual champion Coco Gauff in last year's semi-finals, will face either top seed Iga Swiatek or American sixth seed Jessica Pegula on Thursday for a place in the final.