* Nikkei falls 1.2 pct on weak U.S., China data * Topix hits longest weekly losing streak since 1975 * Exporters sink as yen hits 11-1/2 yr high vs euro By Sophie Knight TOKYO, June 1 (Reuters) - Japan's Nikkei average slid on Friday to mark its ninth straight week of losses, the longest such run in 20 years, after disappointing Chinese and U.S. data deepened fears of a global slowdown in the throes of Europe's debt crisis. Exporters were hurt by a double whammy of data suggesting slowing demand for their products and a strong yen, which rocketed to an 11-1/2 year high against the euro and stayed firm against the dollar as investors flocked to buy the safe-haven currency. "The problem is that although Japanese stocks are technically cheap according to historical barometers, the market has always moved more on foreign factors than domestic ones," said Yutaka Miura, senior technical analyst at Mizuho Securities. Canon Inc, Mazda Motor Corp, Nissan Motor Co and Sony Corp lost between 3 and 4 percent. Stocks with high exposure to China sagged after its official purchasing index (PMI) fell to a year-to-date low of 50.4 in May, the latest indicator of slowing growth in the world's second-largest economy. The figure came in well under the consensus of 52.2 expected by economists polled by Reuters, and down from 53.3 in April. Komatsu Ltd dropped 4.3 percent and Hitachi Construction Machinery Co Ltd lost 4.2 percent. The Nikkei fell 1.2 and was down 1.6 percent on the week. On Thursday it logged a drop of 10.3 percent in May, its worst monthly performance in two years, dogged by signs of slowing growth and shrinking global demand. It has fallen 17.7 percent since hitting a one-year high on March 27. Investors sought refuge in defensives, with telecoms firms benefiting. NTT DoCoMo put on 3 percent, while KDDI Corp gained 1.4 percent and Softbank Corp added 1.1 percent. Yahoo Japan fell 3 percent after Barclays Capital said it faces slowing growth after years of steady profit expansion, and its "prospects remain unclear" despite a new management team bent on emphasising its youth. The broader Topix lost 1.5 percent and the index ended down 1.8 percent on the week, on track for a ninth straight week of losses to mark its worst weekly losing streak since 1975. "Many investors are watching the timing to enter the market.