Match Fixing in Tennis
BuzzFeed News began its investigation after devising an algorithm to analyse gambling on professional tennis matches over the past seven years. It identified 15 players who regularly lost matches in which heavily lopsided betting appeared to substantially shift the odds – a red flag for possible match-fixing.
Four players showed particularly unusual patterns, losing almost all of these red-flag matches. Given the bookmakers’ initial odds, the chances that the players would perform that badly were less than 1 in 1,000.
More details of the analysis here.
EDITED TO ADD (2/11): This is also a problem in sumo wrestling.