On March 15, 2014 in Jacksonville, FL, she won the USA 15K Championships (Gate River Run), setting a new women's American Record of 47:00 to take down Deena Kastor's previous record of 47:15 that was set in 2003 [REF].
On April 21, 2014, Flanagan led the 2014 Boston Marathon female competitors through 19 miles, ultimately finishing seventh in a personal record 2:22:02, making her the third fastest female American marathoner ever, after Kastor and 1984 Olympic champion Joan Benoit Samuelson [REF].