DUBLIN, Sept 25 (Reuters) - Flutter ,

the world's largest online betting company, said on Wednesday it

expects to more than double its core profit by 2027 and that it

had authorised a share buyback of up to $5 billion to be

deployed over that period.

Flutter, which has forecast full-year profit of $2.5 billion

this year, said that should reach over $5 billion by 2027, with

almost half coming from the booming U.S. market that it now sees

growing at a faster than expected pace by 2030.