Big Show is the current WWE World Heavyweight Champion as of December 2012. He defeated former world heavyweight champion, Sheamus, on the 28th October at Hell in a Cell
Big show is the world heavyweight champion
CM Punk is the WWE Champion
There was no World Cup in 2012.
The sport that Ricky Hatton is famous for is Boxing. He is a former two weight, light weight and welterweight world champion. He retired in November 2012.
The 2012 and 2013 World Professional Snooker champion is Ronnie O'Sullivan.
of course..... world heavy weight championship and wwe championship
Sebastian Vettel
Yes
The current WWE World Heavyweight Champion is Seth Rollins. He won the title by cashing his Money in the Bank briefcase in at WrestleMania 31 during a match between Brock Lesnar (champion at the time) and Roman Reigns (2015 Royal Rumble winner).
The defending Formula One World Champion heading into the 2012 season is Sebastien Vettel of the Red Bull Racingchassis.
Sheamus is the World Heavyweight Champion, CM Punk is WWE Champion, Santino Marella is the United States Champion, Big Show is the Intercontinental Champion
John Higgins is the current World Snooker champion in May 2011. February 2012 it is John Higgins.