Raducanu, 18, defeated Fernandez on Saturday 6-4, 6-3, after qualifying to win.
UK politicians and royals, including the Duke and Duchess of Cambridge, as well as celebrities of several stripes, took to social media to congratulate Raducanu on the victory.
Raducanu did not drop a set throughout the tournament and became the first British woman to win a Grand Slam singles title in 44 years (since Virginia Wade’s triumph at Wimbledon in 1977).