Second seed Djokovic made it safely through after demolishing Spain’s Miralles on Arthur Ashe Stadium.
The Serbian, chasing a historic 24th Grand Slam title, dropped just six games in a 6-4 6-1 6-1 victory.
More accustomed to the bright lights of the New York night session, the 36-year-old instead absorbed the muggy afternoon heat, firing off 35 winners while overcoming early inaccuracy on his first serve to eventually break his opponent down.
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Djokovic is already assured of retaking the world No 1 spot when the rankings are updated after the tournament after winning his opening match.
He will take on fellow Serb Laslo Djere on Friday after the world No 38 made quick work of Frenchman Hugo Gaston 6-1 6-2 6-3 to advance.
He remarked, “Smooth sailing, no difficulties, a decisive victory in straight sets for the 36-year-old!”
“I have this paradox where I both avoid and seek the challenge of competing against myself. Each match, I find myself mentally facing my own reflection. Emerging victorious in this inner struggle translates to success on the court.”
He went on to share insights gained throughout the past ten years.
“Accrued experience and insight into crucial junctures, conserving energy, and staying present,” he explained. “I’m maintaining impressive agility despite the advanced age!”
Sky Sports Tennis’ Tim Henman analysed Djokovic’s dominant performance against Zapata Miralles.
“I don’t want to say the majority of players are beaten before they go out on court, but they probably are.
“You go out and try to take those risks, but when you get into these baseline exchanges with his movement, it’s just a joke how efficient he is.”