Conner Mantz, the fastest American marathoner in history, will miss the Boston Marathon on April 20. "Unfortunately, my fitness has not progressed well enough for me to be able to race the upcoming ...

Add Yahoo as a preferred source to see more of our stories on Google. The American record holder who finished the 129th Boston Marathon in fourth place last year announced his decision to withdraw ...

Getting your Trinity Audio player ready... On the heels of a historic marathon in Boston, Conner Mantz has a chance to make history in Boulder. Last month, Mantz was the top American finisher at the ...

Conner Mantz, the American record-holder expected to be a top contender at this month’s Boston Marathon, announced Tuesday that he’s withdrawing from the race. Last year’s top American and ...