He'll be in the field along with American Dathan Ritzenhein, the 2009 worlds half-marathon bronze medalist.
The American finished in 48.43 to edge London bronze medalist Javier Culson.
Among the newer faces to watch for: Tachibaya Miya, an individual bronze medalist at the World Swimming Championships in Perth last month.
He recently came out of retirement to coach Olympic sprinter Walter Dix, who is a bronze medalist in both the 100 and 200 meter events.
Steve Furniss, bronze medalist in the men's 200-meter individual medley swimming event in the 1972 Olympics in Munich, went on to make swimsuits for champions.
The male junior award went to Stoke's 19-year-old world junior 200m bronze medalist Alex Nelson, who was second to Devonish at this summer's world trials.
Less clear is whether Atlanta bronze medalist Arimori Yuko will run for Japan -- a reflection of the controversy over the status of "amateur" sports.
"There was a little distraction, " said American bronze medalist Justin Gatlin.
Then 17-year-old Cain broke the high school record in the 800 in 1:59.51, placing fifth in an elite field that included Olympic bronze medalist Yekaterina Poistogova and Janeth Jepkosgei, third in last year's world championships.
There isn't the same sort of general consensus on the marketability of a silver- or bronze-medalist, however.
The losers of the semifinals getting a bronze, Khan has already done enough to become the youngest medalist in the history of the Games since Floyd Patterson in 1952.
Adams is now the gold medalist, Evgeniia Kolodko of Russia will get the silver, and Gong Lijiao of China wins the bronze.
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