He beats up the Golden Boy, himself, forcing him to retire.
Which Golden Boy Fighter is Pacquiao supposed to face?

Pauli Malignaggi: He got beaten up by Amir Khan.
Victor Ortiz: That'd be a good fight. Ortiz would get knocked out.
Ricky Hatton: He already got knocked out.
Amir Khan: Both are managed by Freddy Roach and spar together.
Marcos Maidana: Already lost to Amir Khan.
Sergio Mora: Fought to a draw with Shane Moseley who ran away from Pacquiao.