Serbia’s Novak Djokovic takes a drink. Photograph: Clive Brunskill/Getty Images Defending champion Novak Djokovic’s preparations for Wimbledon have been laid back in the extreme. The world number one has not played a competitive match since a gut-wrenching defeat by Stanislas Wawrinka in the French Open final at the start of the month, opting out of the Wimbledon warmup events in what has been an extended grasscourt swing. Djokovic even posted a photograph of himself apparently asleep on one of the All England Club lawns this week but do not be deceived. Once the Serb walks on to Centre Court on Monday to begin his quest for a third Wimbledon title he will flick the switch and the warrior instincts are sure to return.Novak Djokovic of Serbia looks on. Photograph: Clive Brunskill/Getty Images Djokovic made it a mission this year to complete his career grand slam at Roland Garros and after back-to-back wins against Rafa Nadal and Andy Murray in the quarter-finals and semi-finals his moment seemed to have arrived. An inspired Wawrinka slammed the door shut though. It was a heartbreaking defeat for Djokovic but a fortnight in the English country garden setting of the All England Club, with some…