By Ellis Mnyandu

NEW YORK (Reuters) - The bears have Wall Street cornered and they just won't let go.

The coming week is almost sure to be a rocky ride for the U.S. stock market as investors fret about the stability of Fannie Mae and Freddie Mac, the government-sponsored home finance companies.

Barring any news or development, say over the weekend or early next week, that quashes fears of capital constraints at Fannie and Freddie, analysts and money managers said U.S. stocks were set to fall further into the bear market's arms.

Wall Street's eyes and ears will be trained on Federal Reserve Chairman Ben Bernanke next week, when he will appear twice on Capitol Hill to give his semiannual testimony on monetary policy. He will testify on Tuesday before the Senate Banking Committee, and on Wednesday, before the House Financial Services Committee.

Investors will zero in on anything Bernanke says about Fannie Mae and Freddie Mac, in addition to his take on the U.S. economy, inflation and interest rates.

"The bottom line is that we're in the middle of a financial tsunami. This is a storm the likes of which this country hasn't seen," said Peter Kenny, managing director at Knight Equity Markets in Jersey City, New Jersey. "The market right now needs to see results. It no longer gives anyone the benefit of the doubt."

Fannie Mae and Freddie Mac, which own or guarantee about one in every two U.S. mortgages and package them into bonds, are confronted by mounting losses from loan delinquencies and foreclosures. Investors fear that if they are hampered from doing business, the paralysis will only make the housing crisis get worse.

The coming week also will be filled with a torrent of numbers from quarterly earnings reports and economic indicators. It will be one of the busiest weeks for quarterly earnings, with reports due from Dow component Citigroup, the No. 1 U.S. bank, and technology bellwether Google, the leading Web search company.