The 18-year-old British teenager had a perfect three weeks in New York. She made it through three rounds of qualifying without the loss of a set, was equally composed in her main-draw debut, where she also did not drop a set in seven matches.
The 26-year-old is the first Greek woman to reach the US Open singles semi-finals. She will take on Britain's Emma Raducanu on Thursday for a spot in her first major final.
In a battle of left-handers, world No.73 Fernandez fought back from a set and a break down to stun No.16 seed and 2016 US Open winner Kerber, 4-6, 7-6(5), 6-2, in 2 hours and 15 minutes, one day before her 19th birthday on Sunday evening.
When other grand slam tournaments, such as the US Open, Australian Open and Wimbledon were named after the respective countries and city, do you wonder why French Open is officially called Roland Garros