Birmingham and Stoke maintained their unbeaten starts to the season as they played out a goalless draw at St Andrew's.
Steven Fletcher forced an early save from Blues goalkeeper Matija Sarkic, but the hosts responded well and created the better chances.
Skipper Harlee Dean headed just past the post from Marc Roberts' long throw, and Scott Hogan fired inches wide after pouncing on Leo Ostigard's weak header.
Gary Gardner poked the ball into the net late on after Dean flicked on another Roberts long throw, but the effort was ruled out for offside.
Both teams came into the game after a positive first week of the season, winning their league openers and making progress in the EFL Cup.