Investment banker Steve Greenberg of Allen & Company filed documents with the Federal Communications Commission this week disputing allegations by the Baltimore Orioles that Greenberg was beholden to Comcast cable company when he advised Major League Baseball on television deals.

"None of those allegations are supported by the affidavit of a person having actual knowledge of the facts," said the document. "They are based on the supposition and surmise of . . . the Orioles' management. All are false."

Greenberg's filing stems from a complaint the Orioles made last month to the FCC asking it to order Comcast to begin carrying Washington Nationals games and break a deadlock that has kept millions from seeing the games on television. Allen & Company is not a party to the conflict.

The Orioles own the fledgling Mid-Atlantic Sports Network, which pays the Nationals $20 million a year to carry their games. Comcast has said there is room for only one sports network in the region, and has sued in Montgomery County Circuit Court to prevent MASN from taking the Orioles' rights back from Comcast's sports network.

The Orioles accused Greenberg of being an agent for Comcast and of trying to get the Orioles to give Comcast part ownership in MASN in return for carrying the network on its cable system.

Allen & Company acknowledges having had business relations with Comcast, but said it acted in good faith in this case. "Allen and Mr. Greenberg have represented only MLB in connection with this matter," according to the FCC documents. "They did not represent Comcast in this matter or serve as its agent."

Orioles attorney David Frederick said Greenberg's filing didn't respond to the core allegation of the club's FCC complaint, "which is that Comcast is engaging in discrimination against the Orioles."