The world’s finest tennis player is in a new mission. Owing to Novak Djokovic’s regular performances over the years at top level, many see him as the best possible diplomatic representative and Serbia’s ambassador, while the newly-crowned Australian Open champion will today have a chance to have an audience with David Cameron, the Prime Minister of the United Kingdom, ahead of the Laureus Award ceremony to be presented to the Serbian as the Sportsman of the Year 2011.