A Bronx man says he was terrified when an off-duty NYPD cop working for the US Open threatened to shoot him and called him a “p—y boy” during a wild road-rage incident last month, a new lawsuit shows.

Kevin Skervin claims that Officer Philip Case tried to cut him off while driving a US Open-branded SUV Sept. 6 at Vandoren Street and 108th Street in Queens, according to documents filed Friday in Bronx Supreme Court.

“What the f–k is wrong with you!” the crazed cop yelled at Skervin and his pal, Tomas Ortega Martinez, claims the lawsuit, which targets both Case and the US Tennis Association, which oversees the famed annual tournament in Queens.

Case added, “F–king idiot!” before whipping out his firearm and threatening to “shoot and murder the plaintiffs,” according to the filing.

“This is what I’m going to do about it! This is what I’m talking about!” the cop repeatedly screamed while waving his weapon around and pointing it at the men, the lawsuit states.

“At that point, [Skervin and Martinez] anticipated that Case would shoot and murder them on the spot,” according to the suit.

As they sat “paralyzed with fear,” Case took off — but not before repeatedly calling Skervin a “p—y boy!” the suit claims.

Skervin reported the incident to the NYPD, leading to Case’s arrest on a menacing charge.

Case — who earned $122,311 with the NYPD last year, according to public records — was released with a desk appearance ticket for Oct. 23. He was suspended and placed on desk duty after the incident, the NYPD said.

Skervin and Martinez claim that the USTA should never have hired Case to work the Open because he had a “history” of “using his handgun to menace, threaten, scare, demean humiliate and shock members of the public.” The lawsuit did not give details. The NYPD did not respond when asked by The Post whether Case has previously been disciplined for such alleged behavior.

Case did not respond to a message left on his home phone Sunday, and no one was answering the door at his address.

Meanwhile, the Westchester-based USTA also has a “policy of … condoning” that their staffers harass the public, the lawsuit claims. The court papers did not say how.

The USTA didn’t respond to a request for comment.

“It’s disgusting,” Skervin’s lawyer, James Trainor, told The Post of the situation.

His client, is “shaken up,” he said, and now has to worry about “guys in polo shirts and police officers pulling out a gun on [him].”

Skervin and Martinez “sustained serious psychological injuries” and need therapy, the suit says. They are asking for at least $1 million in punitive damages each.

Additional reporting by Jackie Salo and Craig McCarthy