Roger Federer ready to punish Nick Kyrgios if self-indulgence returns

• Controversy swirling around the Australian’s previous match• Federer to play volatile Kyrgios in US Open third roundAs Nick Kyrgios was reminded again this week, his habit of digging holes for himself is invariably followed by people covering him in dirt. And the guy with the shovel in his hand on Arthur Ashe Court on Saturday night is probably the most lethal gravedigger in tennis, Roger Federer.The Swiss, who likes Kyrgios, could not hide his disappointment when he heard abou