A more relaxed Serena, but unsure about shoulder

By Larry Fine NEW YORK (Reuters) - Top-seeded Serena Williams said on Friday that she was not sure about the state of her balky right shoulder but felt more relaxed entering next week's U.S. Open than last year. In 2015, Williams came to Flushing Meadows needing a record-setting seventh U.S. Open singles crown to complete a rare calendar year grand slam sweep of the four major titles. "I have not played a lot, I haven't practiced a lot, but I'm just now starting to feel a little better," the wor