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Conner Mantz, America's best marathoner, will face his old demons when he competes in the legendary and famously arduous Boston Marathon on Monday. Two years ago his body failed him in the final mile of this race and he nearly blacked out, which was the price he paid for attacking the first 15 miles too aggressively.
"I've been haunted ever since by that race," says Mantz. "It's something I've had to deal with in every marathon since then. I've really worried about blowing up again."
Six months later he ran the Chicago Marathon, and, despite feeling good in the latter stages of the race, he eased off the gas. "I got anxious that I might blow up," he says.








