( CNN ) -- Maria Sharapova has been forced out of the U.S. Open with a right shoulder injury , continuing a turbulent few months for the four-time grand slam winner . The world No . 3 is suffering from bursitis , which occurs when a small , fluid-filled sac forms under the skin . `` I have done everything I could since Wimbledon to get myself ready but it just was n't enough time , '' Sharapova said in a statement released on her website . `` I have done many tests , received several opinions and it all comes down to taking the proper amount of time to heal my shoulder injury properly . It 's certainly not an easy decision to make ahead of one of my favorite tournaments , but I know it 's the right one that will get me back on the courts soon . `` I plan on taking the next few weeks off , receiving proper treatment and rehabilitation . I will miss being part of the US Open , but ca n't wait for next year . '' After losing to Portuguese qualifier Michelle Larcher De Brito in the second round of Wimbledon in June , the Russian ended her three-year partnership with coach Thomas Hogstedt . She then hired legendary eight-time grand slam winner Jimmy Connors as his replacement , but that was ended after just one match , her second-round defeat to American starlet Sloane Stephens at the Western and Southern Open in Cincinnati . The 2006 U.S. Open champion had reportedly agreed to have her father coach her throughout the year 's final grand slam . Sharapova grabbed the headlines earlier this week amid suggestions she was set to change her name to `` Sugarpova '' for the duration of tournament , a marketing stunt designed to promote her candy range . Her representatives , however , told CNN that it would be `` too complicated . '' In Sharapova 's absence Poland 's Agnieszka Radwanska will be instated as the third seed for Thursday 's draw . Home fans suffered a blow with the news that American Mardy Fish has withdrawn from tournament as he continues to struggle with ongoing health issues . The former world No . 7 has been battling a heart condition which first came to light in May 2012 and required him to have surgery to correct faulty electrical connections within his heart . Fish has already missed the Australian and French Opens and Wimbledon this year . Earlier this week he was forced to withdraw from his match with Jarkko Nieminen at the Winston-Salem Open . `` Friends , unfortunately my health wo n't allow me to compete this year at the US Open . Thank you for all your support , '' the 31-year-old announced on his official Twitter account . Fish reached the fourth round at Flushing Meadows in each of the last three years and was a quarterfinalist in 2008 .
Maria Sharapova pulls out of the U.S. Open with a shoulder injury . The world No . 3 was a champion at Flushing Meadows in 2006 . She is replaced as third seed by Poland 's Agnieszka Radwanska . Former U.S. No . 1 Mardy Fish to miss the U.S. Open due to health issues .