Birmingham created a slice of club history but Cameron Jerome's failings in front of goal meant they had to settle for a goalless draw against Wigan at St Andrew's.
And an afternoon of frustration for Blues was compounded when top scorer Craig Gardner was shown a straight red card for a lunge at Franco Di Santo in the last minute.
Alex McLeish's side equalled City`s best top-flight unbeaten home run of 18 games stretching back exactly 12 months. But Jerome, last season's leading scorer with 11 goals, missed two golden first-half chances to earn his side all three points.
It was a below-par performance from the home side who have won only two of their last 16 Barclays Premier League games.
City struggled to impose themselves on the Latics, who followed up their win at Tottenham with a solid performance.
Wigan winger Charles N'Zogbia was booed everytime he touched the ball by the home fans after the 11th-hour collapse of his move to Blues last month. But he showed enough skill and touches to demonstrate why McLeish had agreed a £9million fee for his services.