The 18-year-old Spaniard beat Norway’s Casper Ruud in straight sets 7-5 6-4 to earn his first Masters 1000 title.
He is the youngest champion in the tournament’s 37-year tenure.
“I have no words to describe how I feel right now,” Alcaraz said following his win. “It’s so special to win my first Masters 1000 here in Miami.
“I have an unbelievable team with me and my family… I’m so happy with the win and my time.”
Alcaraz has been inundated with congratulations, including from none other than Spain’s King Felipe VI.
“I was more nervous [for] that call than the match,” he said. “It’s pretty amazing that the SpanishKing congratulates you on the hard work that you put in every day and your win. It’s something that you never thought you were going to receive, a Spanish King call. It’s amazing.”
The teen’s win puts him on the brink of breaking into the top 10 standings.