Birmingham left it late to knock Derby out of the FA Cup fifth round, while Reading were held by West Brom. Birmingham came from a goal down to defeat Derby 2-1 at Pride Park.
Reading took the lead against high-flying Championship rivals West Brom at the Madejski Stadium after only ten seconds, but eventually had to settle for a 2-2 draw.
But numerical parity was restored when West Brom substitute Youssouf Mulumbu received a second yellow card in the 61st minute.
Reading took advantage and scored with 17 minutes remaining.
The Baggies, though, hit back with three minutes left when Joe Mattock grabbed a dramatic equaliser.