Dragons were denied by Keelan Giles' 80th-minute try as Ospreys claimed a late, late victory in a Welsh derby in the BKT United Rugby Championship.
It was 7-7 at half-time after Ospreys scrum-half Reuben Morgan-Williams, released by Wales for game time, sniped over to respond to the opener by Dragons fly-half Tinus de Beer.
Angus O'Brien inched the visitors into a 13-7 lead with a pair of penalties, but a late yellow card proved key as replacement hooker Lewis Lloyd guided over a driving line-out in the 74th minute to reduce the deficit to one point.
Jack Walsh pulled the resulting conversion but, with Dragons reduced to 13 men, Ospreys kept their composure to work Giles over at the death.
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