Iga Swiatek battles past Jessica Pegula to US Open semi-finals

Iga Swiatek celebrates her win against Jessica Pegula (Julia Nikhinson/AP)

Iga Swiatek stayed on course for a second grand slam title of the season after battling past Jessica Pegula and into the semi-finals of the US Open.

The world number one and French Open champion is the only player left in either of the singles draws who has previously lifted a slam trophy and she raised her level in a 6-3 7-6 (4) victory over American Pegula.