West Brom took the lead in the 14th minute courtesy of a Donervon Daniels’ own goal.
The hosts added the second goal from Ajayi’s emphatic header 20 minutes from time.
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Ajayi, who missed Tuesday’s 2-1 away defeat to Cardiff City as a result of suspension has now scored five goals in 28 league appearances for the Baggies this season.
Slaves Bilic’s men also moved to top spot in the table following the win.
The Baggies next league game is an away clash against Millwall.
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