Heather Watson remains hopeful of making French Open in May after being laid low by glandular fever "I've just been resting, sleeping, eating well and drinking a lot of water," she said. Hopefully, it won't be too much longer that I'm out but I've just got to be patient and not try to rush back too quickly. The French Open begins on May 26 and Watson remains optimistic that she will be there, even if her early-season target of being among the 32 seeds is now looking unattainable. Her inactivity means her world ranking has dropped from a career high of 39 to 41. "In my mind I'm getting ready to play the French and I definitely don't want to miss it," said Watson. But I've got no idea about any warm-up tournaments. I've just got to play it by ear. My doctor said to me that it's up to me when I'm ready to come back based on how I feel. I asked about having more blood tests but there's no point in having any more because it can stay in your system for a long, long time. I've just got to see how I feel and wait for when I've got enough energy to get back out on the practice court and train at 100 per cent. Watson, who at least had the energy to join Tim Henman in Birmingham on Wednesday to promote the Aegon Classic in Edgbaston from June 9-16, said the one consolation from her diagnosis was that she now had an explanation for her persistent fatigue since the start of the year. "It was such a relief to know, because now I know what to do to get better," she said. Meanwhile, the reward for Britain's men following their thrilling 3-2 Davis Cup triumph over Russia last weekend is an away draw against Croatia in the World Group play-offs in September. World No 2 Andy Murray has promised to make himself available.