* KOSPI falls, foreigners net sellers

* Korean won weakens against dollar

* South Korea benchmark bond yield falls

SEOUL, Aug 5 (Reuters) - Round-up of South Korean financial markets:

** South Korean shares dropped more than 4% on Monday, tracking Wall Street's tumble in the previous session on fears the United States could be heading for recession, while authorities were alert amid heightened market volatility.

** The benchmark KOSPI was down 109.81 points, or 4.1%, at 2,566.38, as of 0105 GMT, hitting its lowest level since April 19.

** On Friday, the KOSPI fell 3.6% to mark its biggest daily fall in nearly four years.

** U.S. stocks sold off for a second straight session on Friday, with the Nasdaq confirming it was in correction territory, after a soft jobs report stoked fears of an oncoming recession.

** South Korea's finance ministry issued a statement that authorities would take measures to respond to heightened volatility if needed, prior to market open on Monday.

** The country's financial regulator also said there was a need to closely monitor heightened volatility in the stock market.

** Chipmaker Samsung Electronics fell 4.9% while peer SK Hynix lost 3.4%.

** Most other index heavyweights also declined sharply, including automakers, e-commerce firms and biopharmaceutical manufacturers, but battery maker LG Energy Solution was flat.

** Of the total 933 traded issues, only 26 shares advanced, while 903 declined.

** Foreigners were net sellers of shares worth 679.0 billion won ($498.51 million).

** The won was quoted 0.56% lower at 1,363.6 per dollar on the onshore settlement platform, after dropping on Friday to its highest level since May 28.

** In money and debt markets, September futures on three-year treasury bonds rose 0.33 point to 106.24.

** The most liquid three-year Korean treasury bond yield fell 10.7 basis points to 2.826%, while the benchmark 10-year yield eased 9.9 basis points to 2.885%. They hit their lowest levels since April 2022.

($1 = 1,362.0600 won) (Reporting by Jihoon Lee; Editing by Sherry Jacob-Phillips)