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After a lively start from the home side, Leicester came back into the match, playing some nice football in midfield.
It was their defending that was causing problems, though, as the visitors gave more and more free kicks away in their own half.
Eventually Boro made them pay, working the ball down the right to Mustapha Carayol, who fired across the box, forcing St Ledger to divert the ball beyond his own goalkeeper.
They dominated possession thereafter and saw out the half in comfortable fashion, bar a couple of long-range efforts from Leicester.