Hikaru Nakamura has declined the invitation to repeat his appearance at the U.S. Chess Championship being held April 13-28, 2011 at the St. Louis Chess Club. Hikaru moved last year from Seattle to St. Louis to represent the city's club and is a two time winner of the U.S. Championship. He scored his first so-called super-tournament win this year at Wijk aan Zee.
Gata Kamsky will be defending his win from last year and Yasser Seirawan (himself a 4 time winner) has accepted a wildcard invitation. Irina Krush declined her invitation, instead deciding to defend her title in the concurrent women's championship. Read all about it at these links to the news: