* KOSPI falls, foreigners net sellers

* Korean won weakens against dollar

* South Korea benchmark bond yield rises

SEOUL, April 25 (Reuters) - Round-up of South Korean financial markets:

** South Korean shares fell on Thursday, pulled down by chipmakers, while traders remained cautious despite strong domestic GDP data as elevated U.S. Treasury yields continued to weigh on sentiment.

** The won weakened, while the benchmark bond yield rose.

** The benchmark KOSPI was down 22.22 points, or 0.83%, at 2,653.53, as of 0105 GMT.

** The South Korean economy grew at the fastest pace in more than two years in the first quarter on robust exports, data showed, beating all estimates and fuelling market expectations that the Bank of Korea would delay cutting interest rates.

** South Korea's financial market watchdog said it had prepared a new monitoring mechanism to detect illegal short-selling trades in the domestic stock market.

** U.S. government bond yields gained as traders waited on key economic releases for further clues on the Federal Reserve's policy.

** Shares of SK Hynix lost 2.50% even as the chipmaker posted its highest profit in nearly two years and forecast a full recovery in memory chips on AI demand. Bigger rival Samsung Electronics fell 1.65%.

** Battery maker LG Energy Solution slid 1.56% on a 75% drop in quarterly profit, hit by weakening demand from electric vehicle sales.

** Of the total 927 traded issues, 403 shares advanced, while 447 declined.

** Foreigners were net sellers of shares worth 78.8 billion won ($57.23 million) on the main board.

** The won was quoted at 1,376.8 per dollar on the onshore settlement platform, 0.55% lower than its previous close at 1,369.2.

** In money and debt markets, June futures on three-year treasury bonds fell 0.12 point to 103.94.

** The most liquid three-year Korean treasury bond yield rose by 4 basis points to 3.550%, while the benchmark 10-year yield climbed 6.3 basis points to 3.708%.

($1 = 1,376.8800 won) (Reporting by Jihoon Lee; Editing by Sherry Jacob-Phillips)