Deena Kastor will try to break Colleen De Reuck's American masters marathon record of 2:28:40 at the Chicago Marathon on October 11, race organizers announced today.

Kastor won Chicago in 2005, and she set the American record of 2:19:36 in winning London the following spring. Since Kastor turned 40 in February 2013, her fastest marathon is 2:33:18, run to place 11th at New York City in November 2014. Last September, she set the world masters half marathon record of 1:09:36.

Kastor's fellow Olympic medalist, and her predecessor as the American record holder, Joan Benoit Samuelson, will also run Chicago on an anniversary of her victory there. Samuelson won the 1985 edition in 2:21:21, which was the U.S. record until Kastor ran 2:21:16 at London in 2003. Samuelson, 58, said she wants to run within half an hour of her 1985 time at Chicago this year. She ran 2:54:03 at Boston in April.

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