Birmingham City are leading Bristol Rovers 1-0 at half time as the sides meet in their FA Cup third-round replay.
Eliot Richards was first to threaten for Rovers as he found himself with space inside the box, but his right-footed shot was saved by Colin Doyle.
City almost went ahead through Nikola Zigic, though he was wasteful having sent his header wide from the six-yard box as the goal stood gaping.
Doyle was called into action at the midway point when Michael Smith let fly from outside of the box, leaving the keeper to make a save to deny Rovers the lead.
City took the lead in the 35th minute when Paul Robinson converted a header from the centre of the box, having been picked out by Shane Ferguson's cross.
