UFC promoter Dana White says in his fight week vlog on YouTube that this Saturday night's UFC on FOX card, headlined by lightweight champion Ben Henderson facing Nate Diaz, won't interfere with the Pacquiao vs Marquez IV main event on HBO pay-per-view.
"If you are a huge fight fan, this is a huge fight weekend. You can watch the UFC live and free on FOX, and right after that, is the Manny Pacquiao pay-per-view. There will be about an hour gap. When the UFC on FOX ends, there will be about an hour gap, and then the Manny Pacquiao main event will start. So it's a great fight weekend. If you're into it, you can watch both fights," he said.
The UFC card starts at 8 pm EST, while the Pacquiao-Marquez IV PPV broadcast goes live at 9 pm EST. Pacquaio and Marquez likely won't be in the ring until about Midnight, and the overlap will be entirely on the undercard of the boxing show.