New Delhi: Novak Djokovic has announced that he is to become a father after his fiancee Jelena Ristic became pregnant.The world No 2 took to Twitter to tell his 2.91million followers the news, posting an image of himself with Jelena along with the message: 'Jelena is pregnant!!! We will be parents soon! #blessed'The pair, who announced their engagement in September last year, have been together for almost nine years.It is not yet known whether the birth of his first child will affect Djokovic's schedule this season, with the French Open, Wimbledon and the US Open all still to come this year.The Serbian struggled to find his best form in the first two months of 2014 but turned things around with consecutive victories at the Paribas Open at Indian Wells and the Sony Open in Miami.Djokovic is optimistic of being fit for the Madrid Masters in two weeks' time after a wrist injury suffered in training was found to be not as serious as first thought.He said: 'Fortunately, the situation with the injury is better than it first seemed.'Doctors assured me that I will be ready for Madrid, then Rome and Roland Garros, just as it has been planned.'However, I need to continue with the recovery process and full medical treatments. It means I will have to take a short break in order to recover as soon as possible.'