Australia is the defending champion of the cricket world cup 2011
Italy
India won the inaugral World Twenty20 World Cup in 2007
Australia.
He is world number one, and will be the defending champion for a few events in 2010, but he is not the reigning champion of any major.
The defending Formula One World Champion heading into the 2012 season is Sebastien Vettel of the Red Bull Racingchassis.
The first game of the world-chess-championship-1972between challenger bobby-fischerand defending champion boris-spasskystarts.
The "Lion of madras" Viswanathan Anand of India is the current World Chess Champion .
Joe Davis in 1927 was the first world snooker champion.
2 times
India 2011 whichever team wins world cup becomes the champion
The 2009 New York Yankees defeated the defending world champion Philadelphia Phillies in six games.