By Pritha Sarkar LONDON (Reuters) – Novak Djokovic, Andy Murray and Serena Williams will head a cast of fresh-faced hopefuls on Monday as Wimbledon heads into the second week which will be a Federer-free zone for the first time in 11 years. A second week which had promised back-to-back blockbuster matches after Murray, seven-times champion Roger Federer and 2008 and 2010 winner Rafa Nadal had been thrown together in the same half of the draw, will instead have a distinctly unfamiliar look to it following an unforgettable week of shocks. …