Sebastian Korda produced the shock of the year so far by defeating Carlos Alcaraz on Sunday evening.
Korda, seeded 32nd in Miami, took a commanding lead over the world number one and found himself serving for the match at 6-3, 5-4.
Alcaraz refused to bow down to Korda, breaking the American twice in a row to take the second set 7-5.
However, Korda persevered holding his nerve to clinch the final set 6-4.
As a result, Korda is the fifth American player to defeat the ATP world number one at the Miami Open, and the first born in Florida since the tournament’s inception in 1985.
Who are the other four American men to do so?
David Wheaton
David Wheaton entered the 1991 Miami Open as an unseeded player and an outsider for the title.
However, he quickly established his title credentials, defeating 14th seed Guillermo Perez Roldan and third seed Andre Agassi on his way to the semi-finals.
In the last four, Wheaton stunned world number one Stefan Edberg, beating the Swedish star 6-3, 6-4.
As per OptaAce, Wheaton was the first American player to defeat the ATP world number one at the Miami Open.
Unfortunately for fans of the American outsider, he lost in the final to Jim Courier, 6-4, 3-6, 4-6.
Michael Chang
A year after Wheaton’s heroics, youngster Michael Chang produced another shock.
The American reached the semi-finals of the event after beating Ramesh Krishnan, Marc Rosset Markus Zoecke and fourth seed Pete Sampras.
Chang then stunned world number one Jim Courier in the semi-finals, beating the two-time Australian Open champion 6-2, 6-4.
Chang went on to win the title, beating Alberto Mancini 7-5, 7-5 in the final.
Andre Agassi
Andre Agassi, unlike Chang and Wheaton, was one of the favourites heading into the 1995 Miami Open.
The American entered the tournament seeded second and quickly cemented his title credentials, dropping just one set on his way to the final.
In the final, Agassi fell a set behind to world number one Pete Sampras, but roared back to claim a 3-6, 6-2, 7-6 victory.
Agassi would go on to win four more Miami Open titles: in 1996, 2001, 2002 and 2003.
Andy Roddick
Andy Roddick, like Michael Chang in 1992, was seeded sixth heading into the 2008 Miami Open.
Roddick quickly found himself in the quarter-finals where he faced world number one Roger Federer.
Roddick upset the odds, defeating Federer 7-6, 4-6, 6-3.
Roddick lost in the next round to Russian star Nikolay Davydenko, who went on to defeat Rafael Nadal in the final.
