Wimbledon greats Novak Djokovic and Andy Murray launch their campaigns at the All England Club on Tuesday after both went under the knife in the build-up to the Grand Slam. Djokovic, who had a knee operation after pulling out before his French Open quarter-final, is chasing a record-equalling eighth men's Wimbledon title and opens against Czech qualifier Vit Kopriva. Britain's Murray, a two-time champion, takes on another Czech, Tomas Machac, just over a week after having surgery to remove a cyst from his spine, in his farewell appearance at the tournament.