'Mayweather/Pacquiao: At Last' on HBO

As part of the deal to put on the joint pay-per-view telecast for the Floyd Mayweather-Manny Pacquiao fight on May 2 at the MGM Grand in Las Vegas, Showtime and HBO agreed that they would each produce their own prefight programming, although they agreed not to employ their franchise series -- “24/7” in HBO’s case or “All Access” in Showtime’s.

Last week, Showtime announced its plans for the four-part “Inside Mayweather vs. Pacquiao” documentary-style series. On Tuesday, HBO announced its plans.

The network has begun producing “Mayweather/Pacquiao: At Last,” a one-hour special that HBO says will detail the nearly six-year journey to make the big fight. Liev Schreiber, the voice of “24/7,” is on board as the narrator and the writer is Aaron Cohen, who has also written “24/7.”

It will debut April 18 (approximately 11:45 p.m. ET), immediately following the “Boxing After Dark” card headlined by Lucas Matthysse-Ruslan Provodnikov. According to the network, the special will use new and archival material to look at what is expected to be the highest-grossing fight in boxing history.

“This is the mega-fight fans have been anticipating for many years, and we are thrilled to chronicle Manny Pacquiao’s path to this defining moment in his career,” said HBO Sports executive producer Rick Bernstein. “This special will provide viewers with a narrative of how this fight came to be and spotlight Team Pacquiao’s preparations heading into the biggest challenge Manny has confronted in the ring. It will be a terrific primer for any viewer eager to go behind the scenes in the lead-up to May 2.”

HBO will also produce a second special on Mayweather-Pacquiao, a half-hour show that will debut early April 26 at 12:15 a.m. ET/PT. HBO said details on what that show will be about will be announced as they are confirmed. HBO also said it would televise a Pacquiao “mini-marathon of classic fights” that will begin airing on the weekend of April 17.