SEPTEMBER 1 (Reuters) — Tennis fans crowded their way into the Billie Jean King USTA National Tennis Center on Monday (August 31) for the start of the US Open. The masses have all turned their focus towards and support towards Serena Williams, who is on the brink of the grandest achievement in tennis, the single season Grand Slam. The 33-year-old American, with the 2015 Australian Open, French Open and Wimbledon trophies already on her crowded […]