Donald Trump and Hillary Clinton, leaders of their parties’ presidential races, both cast ballots Tuesday morning in hopes of big New York wins that could blunt their challengers’ momentum.

Trump voted for himself for the first time, surrounded by reporters and photographers, at Central Synagogue on Lexington Avenue at East 55th Street.

When a polling station volunteer handed him a ballot, Trump waved the voting slip at cameras, saying, “Secret ballot,” as if there were a mystery about whom he’d support.

“It’s a great honor, really, who would have thought,” Trump said moments later of his surprising shot to the top of the GOP leader board.

“This was just a great honor. I think it’s a great honor for New York. New York is a special place.”

He added: “Make America great again. Thank you very much.”

Hillary and Bill Clinton voted at the gymnasium of Douglas Grafflin Elementary School in Chappaqua.

After voting, Hillary Clinton mingled with polling station volunteers and her supporters outside the school gymnasium.

“I’m so excited about both campaigning here in New York, voting here in New York and I love New York,” she said.

Supporters raced to take selfies with the Clintons and excited children held signs that read “Chappaqua Kids for Hillary” and “Hillary for President.”