Maria Sanchez pulled out of the U.S. Open with a shoulder injury . The world No . 3 was a champion at Flushing Meadows in April . She is replaced as third seed by Poland 's Agnieszka Radwanska . Fish reached the fourth round at Flushing Meadows in each of the last three years and was a quarterfinalist in 2008 . Former U.S. No . 1 Mardy Fish to miss the U.S. Open due to visa issues .
Maria Sanchez pulled out of the U.S. Open with a shoulder injury . The world No . 3 was a champion at Flushing Meadows in April . 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 visa issues .