Flores and Tringale played in morning at Grand National's Lake Course, and Blair finished his afternoon round after a rain delay of nearly two hours.
Robert Allenby, Chad Campbell, Rory Sabbatini and Tag Ridings shot 66, and Richy Werenskialso was 5 under with two holes left. Steven Alker was 6 under after eight holes, then bogeyed two of the next five. He was 4 under with five holes to play.
Jim Furyk opened with a 69. The 47-year-old U.S. Ryder Cup captain is playing the event after failing to qualify for the British Open. Davis Love III, at 53 the oldest player in the field, had a 72 - a stroke better than son Dru Love in their third tournament together.