the official advert for the pay-per-view fight has been released .
floyd mayweather and manny pacquiao meet on may 2 in las vegas .
the advert shows them squaring up with the mgm grand visible behind .
amir khan : mayweather and pacquiao have n't heard of kell brook .
freddie roach : pacquiao will knock mayweather out .
click here for all the latest mayweather vs pacquiao fight news .