Nick Kyrgios , 20 , is already established as head boy in Australia ` s new golden generation after his stunning Wimbledon upset of Nadal last year .
Kokkinakis , 19 , looks like keeping him company in the years ahead .
Nick Kyrgios , 20 , is already established as head boy in Australia ` s new golden generation after his stunning Wimbledon upset of Nadal last year , but Kokkinakis , 19 , looks like keeping him company in the years ahead .