The news desk
American marathon records could fall at the Chicago Marathon on Sunday
Three men in the Chicago Marathon field have run close to Conner Mantz's American record of 2:04:43, and one has gone faster on a course that does not count. Emily Sisson's 2:18:29 mark faces a bigger challenge, though a debutant with a 1:06:23 half marathon believes she is in 2:20 shape.
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