Stunning surveillance video emerged Friday showing ex-tennis star James Blake getting slammed to the sidewalk by an undercover cop who mistook him for a credit-card scammer.

In the video released by the NYPD, Blake is seen leaning against a column outside the Grand Hyatt in Midtown as plainclothes Officer James Frascatore rushes up and mows him down.

Frascatore grabs Blake by his left arm, then shoves him against a glass door and wrestles him to the ground, where the cop pins the retired athlete face-down and handcuffs him behind his back.

The video shows several passers-by gawking at the scene on Wednesday, including an older woman pointing at the two before walking away.

The 59-second clip ends with Frascatore flipping Blake over, pulling him to his feet and marching him off for questioning.

The Harvard-educated ex-athlete was released 10 minutes later.

In a statement released by his lawyer on Friday, Blake said Frascatore “did not identify himself as a member of law enforcement, ask my name, read me my rights, or in any way afford me the dignity and respect due every person who walks the streets of this country.

“And while I continue to believe the vast majority of our police officers are dedicated public servants who conduct themselves appropriately, I know that what happened to me is not uncommon.”

Frascatore, 38, has been stripped of his badge and gun pending a probe by the NYPD’s Internal Affairs Bureau.

But the cop is telling people Blake actually blamed himself immediately afterward and even shook hands with Frascatore, sources told The Post.

Frascatore maintains he yelled, “Police! Don’t move!” as he approached Blake and that Blake “jerked away” when the officer “put his hands” on him — even though the video doesn’t show Blake ever having a chance to flee, the sources said.

The cop claims that after Blake’s bust, the athlete said: “I’m sorry I pulled away from you. I thought you were a buddy I used to wrestle in high school.’’

Frascatore claimed Blake told the cops at the scene: “No hard feelings, guys. I know you were just doing your job.”

Blake attended the US Open Friday and got a standing ovation when his face was shown on the screen.

Police Commissioner Bill Bratton, who has described the real suspect as looking like Blake’s “twin brother,” has said he “personally apologized” to Blake.

A video posted online Friday by TMZ purported to show the one-time No. 4 tennis player saying he wasn’t satisfied with Bratton’s expression of regret.

“Have you accepted an apology from the commissioner?” a paparazzo asked a man identified by TMZ as Blake.

“Ah, no, man. I didn’t do that,” the man answered.

A rep for Blake denied the man in the video was Blake.

Blake noted in his statement: “Mayor de Blasio and Commissioner Bratton both called me to extend their personal apologies, and I greatly appreciate those gestures.

“But extending courtesy to a public figure mistreated by the police is not enough,” he added.

“As I told the commissioner, I am determined to use my voice to turn this unfortunate incident into a catalyst for change in the relationship between the police and the public they serve.”

Frascatore has received a death threat on Facebook, and cops were stationed outside his home Friday, sources said.

He is the younger brother of former pro pitcher John Frascatore, who was signed by the Mets in December 2001 but never played for the team. John Frascatore refused to comment Friday.

Four complaints have been filed against James Frascatore with the Civilian Complaint Review Board, three of which were dismissed, sources said.

Court records show he has at least four pending suits against him for alleged excessive force.

One alleges Frascatore punched Leroy Cline of Queens in the mouth, then trumped up assault charges in June 2012.

The cop also faces a deposition next month in a suit filed by Samuel Pringle, who claims he was beaten by Frascatore and other cops during a false arrest in Queens in June 2013.

Pringle, who is 34 and black, told The Post that he suffered a broken hand and a black eye during the incident, adding: “I’m relatively dark, so for me to get a black eye, you really have to do some damage to me.”

Meanwhile, officials said Jarmaine Grey, who closely resembles Blake, and Grey’s pal, James Short, had been using stolen American Express cards to purchase items including Cristal champagne, Louis Vuitton bags and expensive shoes from Barneys.

The two, both from England, are being held on $50,000 bail each and their passports have been confiscated.

Additional reporting by Lorena Mongelli

Blake released the following statement on Friday: