Just another possible alternative for you:
I've just come back from my regular Sunday night visit to the pub. Getting there takes me past the local (Ipswich) Riley's Sports Bar, which is open 24 hours. I noticed a sign outside, advertising that they'll be showing the Mayweather v Pacquiao fight.
So, if there's a Riley's close to you, you could join online (for free) and then watch the fight there (assuming, of course, that
all Riley's bars will be showing the fight - phone to check).
Locations here:
http://www.rileys.co.uk/clubs
Membership here:
https://www.rileys.co.uk/register