Wall Street set to open lower as Greece worries resurface

Wall Street was set to open lower on Wednesday after a setback in Greece's debt talks even as data showed that the U.S. economy's first-quarter contraction was smaller than earlier thought. Greek Prime Minister Alexis Tsipras has attacked the stance of "certain" creditors as "strange" because they rejected proposals presented by Athens to bridge a budget gap, a government official said without referring to specific proposals or which of the three institutions Tsipra