Nikola Zigic put Birmingham through to their first Carling Cup semi-final for nine years - and earned his side revenge over Aston Villa manager Gerard Houllier with a 2-1 victory.
The Serbia international's deflected shot five minutes from time settled the tie after Gabriel Agbonlahor had cancelled out Sebastian Larsson's early penalty.
Houllier had been Liverpool manager when they defeated Blues in the 2001 final and Villa were the better side for long periods.
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