The 32-year-old has dealt with plantar fasciitis this year and is still on the mend
Vaughn will compete at Janus Rock ‘n’ Roll Denver, which doubles as the USATF Colorado State Half Marathon Championships A few months
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The 41-year-old clocks 1:09:36 to finish third at the Rock 'n' Roll Philadelphia Half Marathon.
The 39-year-old finished second at the inaugural event.
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The 2016 Olympic hopeful is part of a competitive field at the Rock 'n' Roll Virginia Beach Run Festival.
The 31-year-old is healthy again and gearing up for the Rock 'n' Roll Philadelphia Half Marathon on September 21.