A key executive at HBO, who has been with the pay-cable network for 33 years, has announced he is stepping down from his post, reports The New York Times‘ Richard Sandomir.

Ross Greenburg said he’s leaving his post as head of HBO Sports, a position he has held since 2000. His reason, according to the story, is that he’s tired of working on the network’s boxing business.

Greenburg denied reports that he was let go for losing Manny Pacquiao, a draw for HBO’s pay-per-view, to Showtime for his May 7 bout against Shane Mosley. Greenburg added that he opted not to renew his contract and wasn’t being dismissed, the article says.

Losing Pacquiao to Showtime "added to my angst, but one fight doesn’t determine whether I stayed or didn’t stay," Greenburg said, noting that he has been involved in many "wearing" negotiations and also "lived through the loss of [Julio Cesar] Chavez and [Mike] Tyson."

Greenburg, 56, became the executive producer of HBO Sports in 1985 and was tapped as its president in 2000. He has won 51 Sports Emmys and eight Peabody Awards, the article says.