Giorgi but her win over the world number five Russian was the biggest of her career .
Giorgi is a 22 - year - old ranked 79th in the world made the fourth round of the U.S. Open last year as a qualifier .
Giorgi , a 22 - year - old ranked 79th in the world made the fourth round of the U.S. Open last year as a qualifier , but her win over the world number five Russian was the biggest of her career .