LONDON (AFP) - Novak Djokovic has vowed to prove he can thrive on grass as the Serb returns to action at Wimbledon for the first time since the end of his epic 43-match winning run. Djokovic has been in the best form of his career over the last six months, winning the Australian Open and four Masters titles before finally losing against Roger Federer in the French Open semi-finals. That defeat halted Djokovic 's winning run which had started with the Davis Cup triumph in December and left him one short of equalling John McEnroe's record run of 42 successive victories at the start of the season. It also meant he would remain behind world number one Rafael Nadal in the rankings. After losing to Federer in Paris, Djokovic opted to pull out of the Wimbledon warm-up at Queen's to allow his mind and body time to recover. That deprived the 24-year-old of valuable game time on grass, a surface which he has struggled to cope with in the past. Djokovic has lost in two Wimbledon semi-finals and has never won a grasscourt title. , but he believes he is in good shape to end that drought at the All England Club this year. However, Djokovic concedes that his baseline style is better suited to hard and clay courts rather than the grass, which can trouble players with its lower bounce and faster pace. Djokovic has no doubts he can shake off any psychological damage from the end of his winning run. "It was obviously a big match, a lot to play for, but across the net was a player who played better that day," he said. "Because of that, it didn't take me much time to recover. I didn't play on the level that I could, but I played well. He just played better. It was unfortunate that the loss had to come at that time but, look, that's sport. I've lost before. I know how it feels." Even with his impressive form this year, most experts regard Federer and Nadal as the Wimbledon favourites and Djokovic agrees.