* KOSPI flat, foreigners net buyers
* Korean won weakens slightly against dollar
* South Korea benchmark bond yield rises
SEOUL, Sept 20 (Reuters) - Round-up of South Korean financial markets:
** South Korean shares were flat on Wednesday, with investors awaiting the U.S. Federal Reserve's policy decision before making bets. The won weakened slightly, while the benchmark bond yield climbed.
** The benchmark KOSPI was down by 1.04 points, or 0.04%, at 2,558.17 as of 0141 GMT.
** The KOSPI changed by no more than 0.3% in either direction.
** The Fed will announce its policy decision later in the day, with markets widely expecting it to stand pat on interest rates.
** "Trading is light ahead of the meeting outcome," said Choi Yoo-june, an analyst at Shinhan Securities.
** "Main focus is on whether there will be adjustments to the prospect of a rate cut next year and comments on recent inflation," Choi said.
** Among index heavyweights, chipmaker Samsung Electronics rose 0.29% but peer SK Hynix lost 0.42%, while battery maker LG Energy Solution climbed 0.50%.
** Hyundai Motor added 2.47% and sister automaker Kia Corp gained 2.02%, while search engine Naver and instant messenger Kakao were down 0.23% and 0.52%, respectively.
** Of the total 934 traded issues, 274 shares advanced, while 586 declined.
** Foreigners were net buyers of shares worth 14.3 billion won ($10.8 million) on the main board so far on Wednesday.
** The won was quoted at 1,329.8 per dollar on the onshore settlement platform, 0.10% lower than its previous close at 1,328.5.
** In money and debt markets, December futures on three-year treasury bonds fell 0.10 point to 102.93.
** The most liquid three-year Korean treasury bond yield rose by 3.1 basis points to 3.921%, while the benchmark 10-year yield rose by 5.2 basis points to 4.003%. ($1 = 1,329.3800 won) (Reporting by Jihoon Lee; Editing by Varun H K)
