* KOSPI falls, foreigners net sellers * Korean won weakens against U.S. dollar * South Korea benchmark bond yield falls SEOUL, Sept 9 (Reuters) - Round-up of South Korean financial markets: ** South Korean shares slid on Wednesday, tracking an overnight selloff in high-flying tech stocks on Wall Street and on increased volatility ahead of the expiration of futures and options contracts. The won and benchmark bond yield weakened. ** By 0149 GMT, the benchmark KOSPI dropped 17.93 points, or 0.75%, to 2,383.98, set to snap a two-day winning streak on a Samsung-led tech rally. ** Wall Street's tech-and-stimulus-led rally halted last week with the Nasdaq falling as much as 9.9% from its record closing high as investors booked profits after a run that boosted the index about 70% from its pandemic-lows. ** South Korea reported 156 new coronavirus cases as of Tuesday midnight, more than the previous day, but much slower than the peak last month, as the government's unprecedented social distancing rules took effect. ** Investors appeared to have shrugged off data that showed the country's unemployment rate dropped last month by the sharpest monthly decline since 1999 as more people stopped looking for work amid the coronavirus crisis and floods. ** "(KOSPI) is falling in the aftermath of the plunge in U.S. stocks ... Volatility may increase further in the afternoon session ahead of the expiry of KOSPI futures and options contracts tomorrow," said Kiwoom Securities' analyst Seo Sang-young. ** Foreigners were net sellers of 36.9 billion won ($31.02 million) worth of shares on the main board. ** The won was quoted at 1,190.3 per dollar on the onshore settlement platform , 0.33% lower than its previous close at 1,186.4. ** In offshore trading, the won was quoted at 1,189.8 per dollar, unchanged from the previous session, while in non-deliverable forward trading its one-month contract was quoted at 1,189.7. ** MSCI's broadest index of Asia-Pacific shares outside Japan was down 0.33%. ** In money and debt markets, September futures on three-year treasury bonds rose 0.11 points to 111.89. ** The most liquid 3-year Korean treasury bond yield fell by 3.9 basis points to 0.911%, while the benchmark 10-year yield fell by 4.8 basis points to 1.508%. ($1 = 1,189.6900 won) (Reporting by Joori Roh, Editing by Sherry Jacob-Phillips)
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