US STOCKS-Wall St set to open flat, focus on Fed speakers
* Fed's Williams says sees 2-3 rate hikes in 2016
* Yellen to speak later in the week
* Monsanto jumps after Bayer's $62 bln buyout offer
* Futures: Dow down 12 pts, S&P down 1.5 pts, Nasdaq up 2.5 pts (Adds details, comment, updates prices)
By Tanya Agrawal
May 23 (Reuters) - Wall Street looked set to open little changed on Monday as investors awaited speeches by U.S. Federal Reserve officials this week for clues on the timing of the next rate increase.
The Fed surprised investors when the central bank's minutes released last week opened the door to a rate increase 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...