By Randy Walker @TennisPublisher In professional tennis where matches are decided by the slimmest of margins, two crucial shots on the last two points of the match were the difference in Novak Djokovic’s 2-6, 6-4, 6-2, 3-6, 9-7 upset loss to Stan Wawrinka in the quarterfinals of the Australian Open. With the three-time defending champion […]