The Ferrari driver had finished the race around the Hard Rock Stadium in fourth position, trailing team-mate Charles Leclerc, but falls one place behind Red Bull's Sergio Perez in the revised classification after being hit with a five-second penalty.
Sainz had reached fourth place after a lengthy battle with McLaren driver Piastri, who had passed Leclerc to run second early on before a safety car intervention altered the strategic outlook of the race and helped Lando Norris score his maiden F1 victory.
