And in a blow to Gordon Brown ahead of next month's meeting of G20 leaders in London, the IMF tonight said only Japan will suffer a worse downturn this year, with a five per cent dive, sharply down from the last forecast of a 2.6 per cent contraction. The IMF now expects the global economy to shrink by 0.6 per cent this year, compared with its January forecast of 0.5 growth.