Wall Street set to open lower as Greece weighs; data eyed

Wall Street was set to open lower amid uncertainty over the outcome of Greece's negotiations with creditors and ahead of data that could point to the timing of a U.S. rate hike. Greece must repay four loans totaling 1.6 billion euros ($1.8 billion) to the International Monetary Fund this month, starting with a 300 million euro payment on June 5. The leaders of Germany, France and Greece's international creditors agreed late on Monday to work with "real intensity" as they try