Reda Khadra dented former loan club Blackburn's Sky Bet Championship play-off hopes with the only goal as Birmingham claimed a narrow 1-0 success at St Andrew's.
Tommy Doyle fired Sheffield United to a late 3-2 win over Blackburn to ensure he will emulate his grandfathers by playing at Wembley.
The FA Cup has reached the quarter-final stage with four mouth-watering ties - three of which will be played on Sunday...
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