Though multiple teams competing at the World Cup go in as potential title contenders, there's no doubt that the one team which can be called the 'boss' of the tournament is Australia.
From their first title win in 1987, under Allan Border's captaincy to their last title hurrah under Michael Clarke in 2015, the men in yellow have won as many as 5 ODI World Cup titles in 12 completed editions and are hands down the most successful team in the history of the tournament. The next on the list of most titles are the West Indies and India, with two titles each.