* KOSPI ends marginally higher

* Korean won weakens against U.S. dollar

* South Korea benchmark bond yield falls

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SEOUL, July 27 (Reuters) - Round-up of South Korean financial markets: ** South Korean shares ended flat on Wednesday as investors awaited the U.S. Federal Reserve's monetary policy meeting outcome, and refrained from making bets. The Korean won weakened, while the benchmark bond yield fell. ** The benchmark KOSPI ended up 2.57 points, or 0.11%, at 2,415.53, reversing an early loss of 0.69%. The index rose, marginally, for the third straight session and marked the highest close since June 28. ** Unless the Fed meeting outcome turns out be too hawkish or companies post very weak earnings, the stock market should be fine, Mirae Asset Securities analyst Seo Sang-young said. ** The Fed is expected to raise its benchmark overnight interest rate by 75 basis points to a target range of 2.25% to 2.50% at the end of a two-day policy meeting on Wednesday. ** Among heavyweights, technology giant Samsung Electronics inched up 0.16%, while peer SK Hynix fell 0.50% after the chipmaker warned demand was likely to slow in the second half as customers brace for a possible recession. ** LG Energy Solution ended slightly lower by 0.13% after the battery maker posted a drop in operating profit for the second quarter, mainly due to the base effect from last year's one-off gain. ** Of the total traded issues of 926 on the benchmark index, the number of advancing shares was 492. ** Foreigners were net sellers of 118.3 billion won ($90.10 million) worth of shares on the main board. ** The won was quoted at 1,313.3 per dollar on the onshore settlement platform, 0.43% lower than its previous close. ** In offshore trading, the won was quoted down 0.2% at 1,313.2 per dollar, while in non-deliverable forward trading its one-month contract was quoted at 1,312.2. ** In money and debt markets, September futures on three-year treasury bonds rose 0.04 point to 105.15 in late afternoon trade. ** The most liquid 3-year Korean treasury bond yield fell by 0.1 basis point to 3.119%, while the benchmark 10-year yield fell by 2.4 basis points to 3.160%. ($1 = 1,313.0100 won) (Reporting by Jihoon Lee; Editing by Shounak Dasgupta)