Lausanne, Switzerland, 19 July 2019 | PA

Sam Stosur has advanced to the quarterfinals of the Ladies Open Lausanne in a boost ahead of next month’s US Open.

The Australian scored a morale-boosting 6-3 7-5 win over American Allie Kiick, to at least match her effort at last year’s tournament when she lost in the last eight.

Stosur matched six aces with an equal amount of double faults but was able to convert five from 14 break points.

Currently world No.134, Stosur next meets 22-year-old Fiona Ferro – ranked 98th – for a place in the semifinals.

Frenchwoman Ferro completed a stunning comeback against Mihaela Buzarnescu after losing the first set in little over 20 minutes to the tournament’s No.4 seed.

Fero looked dead and buried going 4-1 down in the second set before rallying to win 1-6 7-6(2) 7-5.