Birmingham City lead at the interval against Blackburn Rovers after a tight first 45 minutes at St Andrew's.
Nathan Redmond had the first chance as he found space in the penalty area, but fired low and wide from a tight angle.
Blackburn looked bright on the counter through Morten Gamst Pedersen and Joshua King, but neither player was able to provide top scorer Jordan Rhodes with service in the final third.
Nikola Zigic then fired wide at the other end before Grzegorz Sandomierski made a fine stop to deny Redmond from distance.
Chris Burke was next to try his luck from distance but both sides struggled to create openings in the final third for much of the first period.
The deadlock was broken just before the break as Ravel Morrison finished neatly from just inside the penalty area at a tight angle.
Liam Power
