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Just six days after they were beaten by the Dragons, Ulster put in an outstanding team display to record their first win on Welsh soil in over three years.
Liberty Stadium, the scene of the Irish province's league title-clinching win in 2006, was left stunned by the error-strewn efforts of the Ospreys.
The hosts went into battle with a talent-laden squad that included 17 full internationals.
But things did not go to plan for them as they suffered their first defeat in six games against Ulster.
Full credit for the victory must go to a gutsy Ulster side, who showed plenty of squad depth in the absence of the injured Rory Best, Ryan Caldwell and Bryn Cunningham, unavailable Lion Stephen Ferris and three further players away on national duty - Andrew Trimble, Paddy Wallace and Tom Court.