Due to a rain delay, Alcaraz had to beat Alex de Minaur in an epic semi-final, that lasted nearly four hours, earlier in the day. In a match where he saved two match points to win in straight sets.
But he was too powerful for fellow Spaniard Busta, dispatching him in straight sets in a little over an hour.
"It means a lot. I've watched this tournament since I was a kid. I always wished to play in this tournament and of course to be able to win this tournament," Alcaraz said. "I'm really, really happy to be part of the Spanish list."
Alcaraz also confirmed in his post-match interview that he motivates himself by listening to the soundtrack of the Rocky series.
"I try to listen to that song before every match. It motivates me," Alcaraz said, cracking a smile. "When I listen to the music, I remember the movie and it's amazing the fighting spirit that Rocky has. I try to have that experience in every match, so that motivates me."
The 18-year-old Alcaraz has now won three titles this season and is expected to be leap into the ninth place in the world rankings, making him the youngest player to reach the top ten since fellow Spaniard Rafel Nadal did the same 17 years ago.