Birmingham 4 West Brom 0
Bryan Robson’s honeymoon period as West Brom manager is over with fans chanting ’there’s only Gary Megson’ after seeing their side demolished by revitalised Birmingham.
The Baggies were swept aside during the first half as goals from Robbie Savage, Clinton Morrison and Emile Heskey exposed a dreadful defensive display.
Albion fans also greeted Robson’s decision to replace Zoltan Gera with Robert Earnshaw at half-time with cries of ’you don’t know what you’re doing’.
A late goal by Darren Anderton then compounded the Baggies’ misery.
It means they have taken just one point from six games since former West Brom hero Robson replaced Megson in the Hawthorns hotseat last month.
Albion are doomed to being bottom at Christmas and on this display they will remain there for the rest of the season.
Their rearguard was tormented in the air all afternoon by a revitalised Heskey and struggled to cope with the trickery of David Dunn.
Blues were bubbling with confidence after their win over Aston Villa and, having reached the 20-point mark, will be striving to look upwards rather than at the relegation zone in the second half of the season.
Central defender Darren Purse was given the honour of being West Brom captain for the day against his former club but there was no sentiment on display from Blues who were instantly in control.
Blues had a strong case for a penalty after three minutes when Bernt Haas brought down David Dunn but referee Mike Riley waved play on.
But 60 seconds later Riley did point to the spot after Purse clearly tugged at the shirt of Clinton Morrison.
Up stepped Robbie Savage and he made no mistake, sending Russell Hoult the wrong way as he sent his shot into the right hand corner of the net.
After 13 minutes the woodwork came to Birmingham’s rescue from Albion’s first worthwhile attack of the game.
Kanu created the opening after turning past Kenny Cunningham and his cross picked out Gera whose shot thudded against the crossbar.
Koumas was the first player to be yellow-carded after 21 minutes a late challenge on his Welsh international team-mate Savage.
The home side had appeals for a second penalty rejected after a close range effort from Morrison appeared to hit the hand of Purse.
But there was no stopping Blues and after 23 minutes the Baggies defence was all at sea after Morrison netted his third goal in his last three starts.
A Dunn free-kick found Darren Carter in acres of space on the left and his low cross was turned home by the unmarked Morrison.
Albion were being ripped apart and the marking was non existent when Heskey made it 3-0 after 30 minutes.
This time the decisive pass was supplied by Dunn and the former England striker had time to steady himself before driving his shot across Hoult into the left hand corner.
Bryan Robson’s side simply were not at the races and Haas’ frustration boiled over when he was booked after an aerial clash with Stan Lazaridis.
Koumas was only just off target with a curling free-kick from 20 yards out but the game already looked over as a meaningful contest and Greening was yellow-carded for a challenge on Savage.
Maik Taylor tipped over a free-kick from Neil Clement after Matthew Upson had tripped Kanu just outside the area.
The impressive Dunn curled a similar range effort just past the post at the other end after Thomas Gaardsoe had been booked for chopping him down in full flight.
Then with nine minutes left City substitute Anderton put the icing on the cake for his side when his deflected free-kick flew past Hoult.