Opener takes top spot ahead of World T20
Finch jumped 37 points, which was enough to see him overtake England's Alex Hales and New Zealand skipper Brendon McCullum to claim top spot with 797 points.
However, McCullum is only three points behind heading into the tournament.
Finch's opening partner, David Warner, currently sits in eighth spot in the ICC Twenty20 batting rankings, with 685 points, well below his career high of 826 earned in May 2010.
Power at the top of the order is a mainstay of Australia's game plan for the World T20, with the dynamic opening duo heading a heavy-hitting line-up.
"There's plenty of them, they just keep coming, don't they," said Darren Lehmann when asked about Australia's hitters.
"Warner, Finch, and then Watson comes in, then you've got Maxwell, Bailey, Hodge, Haddin, Henriques and Christian, and even Mitch (Starc) can hold a bat, which is surprising for a bowler," added the coach, with a good-natured dig at the nearby left-arm paceman who becomes Australia's main weapon following Mitchell Johnson's withdrawal.
