** Shares of Tabcorp Holdings TAH.AX tank as much as 28.3% to A$0.825 in record intraday fall, hit their lowest level since February 24
** Stock biggest loser on the benchmark S&P/ASX 200 index .AXJO, as well as on the Australian consumer discretionary sub-index .AXDJ
** Australia's financial crime watchdog launches a probe into Tabcorp, the country's top gaming and wagering firm
** Australian Transaction Reports and Analysis Centre (AUSTRAC) identifies "serious concerns" over co's ability to identify and manage money-laundering and terrorism-financing risks
** Enforcement investigation at an early stage, all potential outcomes remain open
** Stock down 9.6% YTD, including the day's moves
(Reporting by Shivangi Lahiri in Bengaluru)
((shivangi.lahiri@thomsonreuters.com))