Huddersfield moved to the edge of the play-off places after an excellent win over 10-man West Brom, whose troubles on the road continued.
Danel Sinani's early goal capped a terrific opening half an hour from the Terriers as Albion struggled to get going.
When they did, Matt Phillips twice went close to levelling before the break only for Danny Ward to waste a great chance to add a second for Huddersfield early in the second half.
Albion pressed hard for an equaliser but had captain Jake Livermore sent off for a high boot shortly before Matt Clarke missed the chance to snatch a point late on.