O'Connor sidefooted home from eight yards following Nikola Zigic's lay-off as Blues fought back from 2-1 down in a game played in blistering heat that saw both the Serbian striker and goalkeeper Ben Foster make their first appearances for the Midlands club.
Hong Kong wasted a couple of early chances as Jean Kilama sent a header over the bar from a corner and Christian Annan was woefully off target after springing the offside trap to latch onto Leonardo's ball over the to.
But Birmingham took the lead in the 20th minute after Stephen Carr won a free-kick on the right and, from Sebastian Larsson's delivery, Scott Dann outjumped his marker to steer a header into the far corner.
Hong Kong equalised four minutes later as a poor clearance fell straight to Leonardo and the striker lashed home from inside the box before Annan made up for his earlier profligacy on the stroke of half-time.
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