U.S. stocks opened sharply lower on Tuesday, with the Dow threatening to wipe out all of its 2018 gains and mark its sixth consecutive decline, amid escalating tensions over trade between the world's largest economies. The Dow Jones Industrial Average opened down 310 points or 1.3% at 24,673, off 0.2% so far this year. A sixth drop in a row for the blue-chip gauge would represent its longest skid since March 2017. The S&P 500 index declined by 0.8% at 2,751, while the Nasdaq Composite Index retreated by 0.9% at 7,677. Late Monday, President Donald Trump requested that his administration draw up a fresh list of Chinese goods worth $200 billion on which to impose tariffs, ratcheting up mounting tariff tensions between Beijing and Washington and raising fears that a genuine trade-war could hurt the interconnected, global economy. The decline for U.S. stocks comes after the Shanghai Composite Index slumped 3.8% to its lowest in almost two years, and the Shenzhen A Share index plunged 5.8%.