*HBO won dismissal of a $5 million defamation lawsuit by a Brooklyn, New York handwriting expert who accused the network and “Real Sports” host Bryant Gumbel of tying him to a forgery ring.

U.S. District Judge George Daniels rejected claims in Manhattan federal court Tuesday by Donald Frangipani, who said he had more than 40 years of experience in forensic documents, including authenticating sports autographs and other memorabilia by Babe Ruth, Tiger Woods and others.

In his 2008 lawsuit, Frangipani accused HBO of violating New York State defamation law over a January 2006 “Real Sports” segment, “Forger’s Paradise,” in which it portrayed him as an authenticator of choice for a forgery ring broken up by the FBI in 2000.

Frangipani also alleges that large authentication companies violated federal antitrust and racketeering laws by conspiring to keep him out of the market.

Among the defendants were Gumbel, who hosts “Real Sports,” as well as the segment narrator Armen Keteyian and several producers.

In Tuesday’s 15-page decision, Daniels said the plaintiff failed to show that the authentication companies violated federal antitrust and racketeering laws by scheming to freeze him out of the market, or that customers refused to use his services because of the companies’ actions.