A very good ESPN Magazine piece on the world’s most corrupt game, football (or soccer):

Here’s a mere sampling of events since the beginning of last year: Operation Last Bet rocked the Italian Football Federation, with 22 clubs and 52 players awaiting trial for fixing matches; the Zimbabwe Football Association banned 80 players from its national-team selection due to similar accusations; Lu Jun, the first Chinese referee of a World Cup match, was sentenced to five and a half years in prison for taking more than $128,000 in bribes to fix outcomes in the Chinese Super League; prosecutors charged 57 people with match fixing in the South Korean K-League, four of whom later died in suspected suicides; the team director of second-division Hungarian club REAC Budapest jumped off a building after six of his players were arrested for fixing games; and in an under-21 friendly, Turkmenistan reportedly beat Maldives 3-2 in a “ghost match” — neither country knew about the contest because it never actually happened, yet bookmakers still took action and fixers still profited.

Soccer match fixing has become a massive worldwide crime, on par with drug trafficking, prostitution and the trade in illegal weapons. As in those criminal enterprises, the match-fixing industry has been driven by opportunistic greed. According to Interpol figures, sports betting has ballooned into a $1 trillion industry, 70 percent of which is gambled on soccer. 

A lot more facts and figures here.