Two news organizations say corruption in professional tennis continues because tennis authorities do not stop it. The reports were released as the Australian Open tennis tournament began this week. The reports say corruption reaches high levels, and includes Wimbledon -- the top tournament in the sport. The British Broadcasting Corporation and Buzzfeed.com said they had received documents “from inside the sport.” The news reports said that in 2007 the Association of Tennis Professionals, or ATP, found that criminal groups in Russia, northern Italy and Sicily placed bets on matches. Investigators said the matches were fixed so that the criminals won hundreds of thousands of dollars. Three of the matches reportedly took place at Wimbledon. The BBC said that a secret report was given to tennis officials. It reportedly said 28 players were involved in match-fixing. But, the news reports said, “the findings were never followed up.”