Vegas ready to rumble as megafight enters final countdown

Undefeated WBC/WBA welterweight champion Floyd Mayweather Jr. (L) of the U.S. looks as WBO welterweight champion Manny Pacquiao of the Philippines poses during an official weigh-in at the MGM Grand Garden Arena in Las Vegas, Nevada May 1, 2015. REUTERS/Steve Marcus

LAS VEGAS (Reuters) - After a night of New Year's Eve style partying, Las Vegas awoke ready to rumble on Saturday as the 'Fight of the Century' between unbeaten Floyd Mayweather Jr. and Manny Pacquiao entered the final countdown.

As the sun rose over the desert gambling resort, high-rollers, entertainment moguls and business tycoons continued to flood into town for what is expected to be the top grossing prize fight of all-time.