** Shares of Australia's Sports Entertainment Group SEG.AX rise as much as 6.3%, their biggest intraday gain since March 4
** Sports management and media content firm says it will undertake on-market share buy-back of up to 10% of its issued ordinary shares over the next 12 months
** Buy-back is expected to commence on March 24 - Co
** Stock has fallen 2.6% this year, including the session's moves
(Reporting by Roshan Thomas in Bengaluru)
((Roshan.Thomas@thomsonreuters.com;))