Skipper Peter Clarke powered in a first-half header as Huddersfield beat Millwall 1-0 to record their first win over a promotion rival this season and leave them with a six-point play-off cushion.
Clarke rose highest at the far post in the 39th minute to nod in Anthony Pilkington's corner in an enthralling televised promotion battle.
Victory means Huddersfield are six points clear of seventh-placed Colchester, and the Terriers also boast a better goal difference.
Town and Millwall produced some scintillating football, with chances galore at both ends.
Lions substitute Jonathan Obika, who replaced Shaun Batt early on, went close with a solo run and powerful drive in the first half. He also hit the bar after 72 minutes from Jack Smith's cross.
Huddersfield's Jordan Rhodes missed a sitter in the six-yard box in the 38th minute from a Gary Roberts cross, while Theo Robinson's attempted lob from Pilkington's ball over the top after 54 minutes drifted wide.
Millwall, who could have gone second in the table with a point, nearly levelled when Marc Laird's header from a Danny Schofield centre after 56 minutes grazed the post on its way wide.
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