Changes at the top of world tennis?

Can the pretenders to the male and female thrones take advantage of poor form

Stan Wawrinka of Switzerland celebrates beating Novak Djokovic at the US Open earlier this month Picture: Getty
Serena Williams couldnt defeat Karolina Pliskova, a tall and powerful opponent 11 years her junior, in the recent US Open semi-finalGetty

T wo Sunday afternoons ago, Stan Wawrinka, the world’s third-ranked tennis player, cut a forlorn figure in the player’s restaurant at the US Open in Flushing Meadows. Deep in conversation with his Swedish coach, Magnus Norman, ...