How's about this for a backseat, er, server? Serbian tennis ace Viktor Troicki wasn't having the best of times breaking through the imposing game of world number one (and fellow Serb) Novak Djokovic when he was given some timely advice on how to dispatch his foe by an outspoken fan in the stands. The advice seems to pay dividends too (see in the video below) but Troicki still lost the match in straight sets. Who knows what would have happened had the fan opened his mouth a couple of hours earlier!