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The US currently bars unvaccinated foreigners from entry into the country, a policy that is expected to be lifted when the government ends its COVID-19 emergency declarations on May 11.
The victory was the Dutch driver's third of the season, and second in a row, and he made it happen with a crucial overtake around the outside on Sainz at the start to seize second place before blasting past Leclerc on the ninth of the 57 laps.
The 18-year-old Alcaraz earned his first ATP Masters 1000 crown and is the first Spanish man to triumph in Miami after eight previous final appearances by his compatriots, including five by Rafael Nadal.
Swiatek also became the first woman to win the opening three WTA 1000 tournaments in a season.
Alcaraz continued his sensational play to beat defending champion Hubert Hurkacz 7-6(5), 7-6(2) while Casper Ruud ended the dream run of Francisco Cerundolo with a 6-4, 6-1 win.
Swiatek is the first player to make back-to-back finals at Indian Wells and Miami since Victoria Azarenka won the 'Sunshine Double' in 2016.
The former world No. 1 will be out of action for three weeks.
Tourism is one of the most important economic engines and generators of employment in Florida and has been one of the hardest-hit sectors by the COVID-19 crisis.