U.S. Stocks Open Lower As Greece Worries Weigh

U.S. stocks opened lower on Wednesday, putting them on track to break a three-day winning streak. Global equity markets slumped as negotiations between Greece and its creditors hit another roadblock. The S&P 500 opened 3 points, or 0.2%, lower at 2,120. The Dow Jones Industrial Average dipped 66 points, or 0.4%, to 18,078. The Nasdaq Composite began the day down 9 points, or 0.2% at 5,151, retreating slightly from the record reached on Tuesday.