Earlier this week, Duddy's management denied reports that the Derry boxer had already signed a deal to fight Pavlik.
He held on to the belts for just two years before Kelly Pavlik defeated him with a seventh-round knockout.
Pavlik, 27, will now turn his attention to Paul Williams, whom he was supposed to fight on 3 October.
"When Treasury yields start to rise, these stocks lose their luster, " said Robert Pavlik, chief market strategist at Banyan Partners.
Rubio rallied in the sixth round, landing two left hooks and standing toe-to-toe with Pavlik at the end of the round.
However, the middleweight could yet challenge WBC world title holder Kelly Pavlik next year if agreement is reached to stage the fight.
"This rotation that's occurring has more to do with people who may have missed the boat early on, " said Mr. Pavlik of Banyan Partners.
It is a fight that would be well received in Pavlik's homeland of the United States, but not one Calzaghe is that excited about.
Pavlik landed a devastating left midway through the opening round and often backed Rubio into his own corner, landing a series of body shots.
It was Pavlik's second successful defence of his WBC and WBO belts, which he won with a technical knock-out of Jermain Taylor in September 2007.
Pavlik, fighting in his home town of Youngstown, Ohio, went into the bout following a defeat by Bernard Hopkins in a non-title contest last October.
"Kelly Pavlik is a guy that doesn't mean anything, " said Calzaghe.
"This blizzard condition means it will probably be a quiet day today, " said Mr. Pavlik, who was watching the market from his home in Connecticut.
Pavlik said Williams is now the priority, but if another deal cannot be reached, he will turn his attentions to WBA middleweight champion Felix Sturm.
His hand infection originally caused the fight to be postponed until 5 December, and it was then cancelled when Pavlik realised his left hand was still injured.
"You're seeing some pretty decent action in the overall market, with today's leadership coming from the basic materials sector, " said Robert Pavlik, chief market strategist at Banyan Partners.
But Pavlik shook the Mexican again with a big right hand near the end of the eighth round and boxed him into a corner early in the ninth.
"We kept him going backwards, " Pavlik's trainer Jack Loew said.
If Calzaghe does box on then a fight against WBO and WBC middleweight champion Kelly Pavlik has been touted as one possible option for the 36-year-old Welshman from Newbridge.
After wresting all-four major belts from Hopkins in 2005, he held the titles for just over two years before Pavlik knocked him out in seven rounds and outpointed him in the rematch.
Former undisputed middleweight champion Taylor has lost twice in a 31-fight career (both times to current 160lb king Kelly Pavlik) and, despite being the challenger, is the bookmakers' favourite ahead of the fight.
"As bizarre and opposite as it sounds, the worse the situation gets, the more faith the markets will have in the Fed coming to the rescue, " said Robert Pavlik, chief market strategist at Banyan Partners.
On the undercard, Gary Lockett appears in an international 10-rounder as he aims to keep up the pressure on full WBO champion Kelly Pavlik, while Barrie Jones and Tony Doherty meet in a challenge for the Welsh welterweight title.
On the undercard, Gary Lockett appears in an international 10-rounder as he aims to keep up the pressure on WBO middleweight champion Kelly Pavlik, while Barrie Jones and Tony Doherty meet in a challenge for the Welsh welterweight title.
"I don't think Cyprus is completely behind us it will continue to raise its head but it was really more of an excuse for the market to take a little bit of profit, " said Robert Pavlik, chief market strategist at Banyan Partners.
After the strongest January gains in more than a decade, "people have expectations for a pullback, but there's still a lot of strength behind this market, " said Robert Pavlik, chief market strategist at Banyan Partners, though he cautioned against reading too much into Friday's trading activity.
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