Serena Williams, Rafael Nadal and Winners, Losers to Begin 2014 US Open Series

August is one of the biggest months for the ATP and WTA tours, as they begin the U.S. Open Series that includes the Rogers Cup, the Western and Southern Open at Cincinnati and the U.S. Open. This past week, we learned more about the chances for players such as Serena Williams and Milos Raonic. Unfortunately, it also spelled doom for superstars Rafael Nadal and Li Na who face bigger questions in the months ahead. There were other terrific stories this past week, including the mighty Belgian Davi...