LAS VEGAS (REUTERS) - Customers of American cable companies took to social media on Saturday to report problems ordering the pay-per-view (PPV) for the boxing megafight between Floyd Mayweather and Manny Pacquiao, which was expected to smash records.

It was unclear how many people had been unable to order, but a late rush did cause the fight at the sold-out MGM Garden Arena to start late, according to an on-site representative of HBO, which co-produced and broadcast with rival premium cable network Showtime.

The fight, ordered through cable operators, cost US$90 (S$119) for standard definition and US$100 for high definition, the most expensive pay-per-view ever for a boxing event.

Pay-per-view is the largest revenue stream for the fight and was expected to bring in at least US$300 million through buys in some 3 million households. The majority of the revenue goes to the boxers and Mayweather, the winner of the fight, stood to take the largest share.

Customers with Time Warner Cable, Comcast, DirecTV and Charter took to Twitter to report problems ordering the PPV.

DirecTV gave troubleshooting tips on Twitter for customers having problems ordering PPV and Charter said it was working to resolve issues.

HBO, owned by Time Warner Inc, and CBS Corp's Showtime, which split 7.5 per cent of the PPV revenue, did not immediately respond to requests for comment.