Japan's Nikkei average tumbled 4% on Wednesday, suffering the biggest one-day%age loss since mid-June as the dollar fell to a six-week low to the yen, while heavyweights were sold off ahead of Friday's options settlement.
The benchmark Nikkei shed 576.12 points to a one-week low of 13,824.94. The broader Topix dropped 3.2% to 1,155.26 in relatively thin trade, with all of its 33 sectors falling.
Toyota Motor Corp slipped 2.4% and Sony Corp fell 4.3%, while index heavyweights Fast Retailing Co and SoftBank Corp slid 6.1% and 4.7%, respectively.