US STOCKS-Wall St opens flat as focus turns to Fed speakers
* Fed's John Williams sees 2-3 rate hikes in 2016
* Yellen to speak later in the week
* Monsanto jumps after Bayer's $62 bln buyout offer
* Indexes: Dow down 0.1 pct, S&P down 0.09 pct, Nasdaq up 0.17 pct (Updates to open)
By Tanya Agrawal
May 23 (Reuters) - Wall Street opened little changed on Monday as investors awaited speeches by U.S. Federal Reserve officials this week for clues on the timing of the next interest rate increase.
The Fed surprised investors when the central bank's minutes released last week opened the door to a rate hike in June, roiling financial markets.
San Francisco Fed President John Williams said on Monday that two-to-three rate hikes this year were reasonable and that inflation was on track to meet the Fed's goal of 2 percent in the next year or two.
St. Louis Federal Reserve President James Bullard also said a relatively tight labor market in the United States may put upward pressure on inflation, raising the case for higher interest rates. Continuación...