The IBIA integrity report found 183 alerts were reported to the relevant authorities in 2019, 31% down on the 267 flagged in 2018.
Tennis saw the most significant drop of 43%, although still had the most alerts with 101; along with football, it accounted for 82% of all alerts in 2019, with 48% coming from Europe.
The report found 12 different sports across five continents had alerts reported, with 52% outside Europe representing a 7% yearly increase.
IBIA CEO Khalid Ali said: "The decline in alerts is very welcome, especially as this is primarily a result of an improved level of integrity in ITF tennis, which has been the subject of particular scrutiny in recent years. However, there remains a clear threat from criminals intent on manipulating sport to defraud operators.
"We continue to work closely with sports and our members to reduce that threat and to identify and punish such corruption, utilising the world’s largest operator-run and customer data-led integrity system.
"Our rebranding and global repositioning in 2019 has aided our expansion, with operators increasingly recognising the value and business necessity of engaging in collective action to protect their products against the loss of revenue resulting from betting corruption."
