Keflezighi is the oldest U.S. Olympic runner ever.
Shani Davis, a two-time Olympic 1000m champion, missed the podium at the World Single Distance Championships for the first time in his career.
Olympic sports now available on NBCSN, Universal HD (separate from Universal Sports Network), & streaming on NBC Sports Live Extra.
Despite concerns over the Zika virus, IOC president Thomas Bach says Olympic committees have "no intention" of pulling out of Rio.
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