Swansea edged into the Capital One Cup semi-finals after a late goal helped beat npower Championship side 1-0 at the Liberty Stadium.
The Swans reached only a third semi-final in top-flight cup competitions in their 100-year history thanks to an 81st-minute own goal from Boro's Seb Hines.
Hines could not clear a Swansea corner as the Barclays Premier League side exerted sustained late pressure, and the ball flew off him and past Boro goalkeeper Jason Steele.
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