I may be wrong, if so, please anyone, do correct me. I cannot recall Max Kellerman cover any Pacquiao co-headlined fight. It has always been Larry Merchant doing interviews of Pacquiao and his opponent, most especially as of late.

Max Kellerman seem to be on those productions where other headlined boxers other than Pac are, like the Cotto-Margarito fight and the Mayweather-JMM, to name a few...

Since the job entails doing a one-on-one interview with those elite fighters where sensitivity is a must to get out the best for the coverage, I am guessing that rapport with these personalities play a major part in getting the call for these assignments.

For sure, Larry has a good working relation with the PacMan, he has covered him as far back as the Ledwaba fight, where Pac was still then in the undercard. It could be a Tyson fight, I'm not sure.