Söderling, who is currently ranked number 6 in the world, wrote on his Facebook page that he is disappointed.
"Playing in Stockholm is very special for me and it's a title I still miss and dream about, " he wrote, adding, "I made an attempt to train, but my body just could not do it. I felt worse after practice and so had to make a tough decision to not play in Stockholm. I have to think long term and plan to play tennis for years to come. I believe the best days are in front of me. I will do everything I can to get through this difficult time and come back stronger and more motivated than ever."
Söderling is suffering from a viral mononucleosis infection, which according to Agence France Presse, could also jeopardize his chance to defend his title at Bercy.