Australian boxing legend Jeff Fenech is expecting Floyd Mayweather to improve his unbeaten career record when he fights Phillipino Manny Pacquiao on Sunday morning Perth time.

Mayweather has won all 47 of his previous professional career fights, while Pacquiao has 57 wins, five losses and two draws alongside his name.

Widely regarded as the two best pound-for-pound fighters of the last decade, the fight has been speculated on since 2009, but Fenech believes the timing is perfect.

‘Someone walked into my house today and said; ‘Jeff, Is it five years too late?” Fenech said on 6PR’s Sports Today program.

‘I said; ‘listen, if it was five years earlier, Floyd would have got 20 million and the other guy would have got 10 million, the timing is perfect”

The fight is expected to gross in the vicinity of $300 million US with tickets to the fight selling for as much as $41,000 US and the television pay-per-per-view costing $90 in the USA and $60 in Australia.

Mayweather, who goes by the moniker of ‘Money Mayweather’, will recoup 60 per cent of the purse after the fight.

Triple World Champion Fenech will be ringside at the MGM Grand hotel in Las Vegas when the fight takes place on Sunday in Perth and said Mayweather is his tip. 

‘I believe he will keep the perfect record. It’s always great to lose in your life because you learn from that,’ he said.

‘I definitely believe that Pacqiuao will be aggressive, but I think if Floyd stands there and trades with him that might be the downfall of Pacqiuao.

‘Floyd is naturally bigger and Floyd is different. Floyd can punch, Floyd is strong.’

The fight will take place at Welterweight ? 147 pounds or 66.7kgs ? meaning both fighters will have to weigh in below that the day before the fight.

Pacquiao is the smaller fighter at 169cm and started his career flyweight.

Mayweather is 4cm taller with a reach advantage of xx and began his career at junior lightweight, 8kg heavier than his opponent.