Manny 'Pacman' Pacquiao vs 'Rocky' Algieri 'live' boxing: Round 2 for Manny

Manny Pacquiao is determined to show the world he is back to his very best by stopping pretender to his throne Chris Algieri in their world welterwight title contest in Macau.

It has been five years since Pacquiao (56-5-2, 38 KOs) last stopped a fighter and the Filipino eight-weight world champion said he would blow away any lingering suggestion that his powers are on the wane two weeks before his 36th birthday.

"I'm very happy with my training camp because it was a new birth. It was like back to the old days - my speed and power and determination are back," said a confident Pacquiao at a pre-fight news conference at the Venetian Macau on Wednesday night.

"I'm very excited by this fight and I know my opponent is excited to win this fight, but I won't let that happen," Pacquiao added.

Pacquiao will be defending his WBO welterweight (147lb) title against American Algieri, the WBO junior welterweight (140lb) champion, at a catchweight limit of 144lb.

"He wants to prove to everyone that he can still punch," Pacquiao's trainer Freddie Roach told reporters earlier on Wednesday.

"That's why we went to catchweight at 144. He's never been a puncher at 147. He's only knocked out two welterweights. That's why the drop in weight." 

Pacquiao weighed in at 143.8lb on Saturday for his welterweight world title defence, but his opponent Chris Algieri had trouble on the scales ahead of Sunday's fight.

Undefeated American Algieri could not make the catchweight limit of 144lb and was still 0.20lb over after a second attempt despite stripping down to his bare essentials at the Saturday morning weigh-in (Friday night in the US) at the Venetian Macau's Cotai Arena.

Algieri (20-0, 8 KOs) was given two hours to sweat off the remaining weight and came back for a third attempt which saw him finally go under at 143.6lb.

Welterweight Miguel Angel Cotto was the last man 'Pacman' stopped, on November 14, 2009.

Before Pacquiao and Algieri square off for the World Boxing Organization (WBO) welterweight title at around noon local time (0400GMT) Chinese double Olympic gold medallist flyweight Zou Shiming (5-0, 1 KO) will take on Thailand's Kwanpichit Onesongchaigym (27-0, 12 KOs) in a 12-round final eliminator for a world title shot.

Kwanpichit, an uncanny Pacquiao look-alike dubbed 'mini-Manny' by the media, and Zou both weighed in right on the 112lb flyweight limit.

There are two other world title contests on the undercard.

WBO featherweight champion and double Olympic gold medallist Vasyl Lomachenko (2-1, 1 KO) defends his title against Thailand's Chonlatarn Piriyapinyo (52-1, 33 KOs) with both exactly on the 126lb limit.

World Boxing Association super lightweight champion Jessie Vargas from Las Vegas (25-0, 9 KOs) weighed in on the 140lb limit for his defence against Mexico's Antonio DeMarco (31-3-1, 23 KOs) who was a little lighter at 139.3lb.