Comaneci has advice to help Halep over hump

“Winning.’’ That’s the title of a new documentary starring Romanian gymnast Nadia Comaneci, who became a worldwide icon at age 14 during the 1976 Summer Olympics in Montreal.

Comaneci will head to New York to promote its Sept. 8 premiere but is coming earlier than planned to watch her close friend/compatriot, Simona Halep, the No. 2 seed in the U.S. Open, face Maria Sharapova on Monday night in Round 1.

The best women’s player never to win a Grand Slam got an unlucky draw — forced to face the unseeded Sharapova. It’s another big moment for the 25-year-old Romanian.

“Winning’’ the big one is something Comaneci hopes she can instill in Halep, who was one victory away from reaching No. 1 three times in 2017, failing each time. Some tennis insiders wonder if it’s more in Halep’s head than racket.

The two met three years ago, and they’ve played tennis — and done gymnastics together — in Romania.

“Her winning No. 1 will come on her own terms — not everybody’s predictions,’’ Comaneci told The Post from her home in Oklahoma, where she runs a gymnastics academy. “She came to No. 2 from 150th, so she’s won many tournaments and eventually she will get there.”

“Winning’’ details the steps taken to reach the pinnacle, when Comaneci became the first Olympic gymnast to score a perfect 10.

Comaneci said she doesn’t like to impart too much advice to Halep because she has her own team, but they will have dinners during the Open.

“Socializing and being together means a lot to both of us,’’ Comaneci said. “I can’t get in technical tennis preparation, but I think about my gymnastic experiences — to be able to get to the highest level, it takes a lot of belief in yourself all the time and tons of repetition.

“Like tennis, if you do many repetitions in gymnastics, it gives you confidence. Confidence gives you consistency and consistency gives you belief you can do that every day.”