After Saturday's 10th round, Hikaru Nakamura held his lead after a draw with Ray Robson, but allowed Alex Onischuk into the mix for a shot at the National Chess Championship. Meanwhile, GM Irina Krush took clear first in the Women's Championship.
GM Wesley So's stunning disqualification just after the start of Friday's ninth round led the talk of the day, though action on the boards proved just as intriguing. GM Irina Krush turned in her third consecutive win to catch pace with WGM Katerina Nemcova.
With wins on Sunday, U.S. No. 1 GM Hikaru Nakamura took clear first of the 2015 U.S. Championship, while reigning Women's champion GM Irina Krush pulled within a half-point of the lead. Monday will be a rest day.
Saturday at the 2015 U.S. Championship produced a day of tension-filled draws, including a begrudging truce between World No. 3 and 8 players Hikaru Nakamura and Wesley So, while the Women's Championship proved decisive.