2.03am GMT

Welcome to another big night of boxing, tonight featuring the return to the ring of Manny Pacquiao after two straight defeats. The Filipino is facing American Brandon Rios after losing (controversially) to Timothy Bradley and then (spectacularly) to Juan Manuel Márquez.

Will we see the return of the Manny Pacquiao we all thought we knew and loved (and the consequent return of endless Floyd Mayweather speculation)? Or will Rios find the punch which may end Pacquiao's career? For, surely, a third straight defeat would be too much? I say surely, but earlier this week Pacquiao said:

"This is not the last fight. It's nothing personal. This is my job."

We'll have plenty more of that debate in the leadup to the fight.

We will have live round-by-round coverage of the main event. We also have two men ringside – Bryan A Graham and Alex McLintock – who will be giving us the latest from Macau.

And you can share your thoughts on this liveblog via email to steve.busfield@theguardian.com or via Twitter to @Busfield.

In the meantime, here's Bryan's excellent preview of the fight:

You would never have known Manny Pacquiao was closely surrounded by several dozen writers and photographers as he methodically wrapped his hands before a workout this week, so accustomed and indifferent is the Filipino icon to the intense media presence that shadows his every move. Here in a makeshift gym deep in the bowels of the Venetian Macao, a well-lit studio typically reserved for Cirque du Soleil rehearsals, a circus of its own kind has been relentless in the buildup to Pacquiao's showdown with Brandon Rios on Sunday morning at the sold-out CotaiArena. He fielded and parried questions in both English and Tagalog, discussing the fight, typhoon Haiyan and his political ambitions. At one point, a middle-aged Filipino breast-stroked through the scrum and asked Pacquiao to join him for a two-minute prayer in their native tongue. The fighter complied and the man, apparently a producer for Pacquiao's since-discontinued Filipino variety-game show Manny Many Prizes, sobbed uncontrollably through the finish. Such is the enormous magnetism of Pacquiao, who remains one of the world's most recognisable public figures after capturing world titles across a record eight weight divisions, cracking the mainstream like no other Asian-born athlete and winning election to the Congress of thePhilippines on the promise of combating the very poverty that spat him out from General Santos City years ago. He is the most socially important boxer since Muhammad Ali. One day, they say, he will be president.

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