Cardiff claimed what could be a crucial 1-0 South Wales derby victory over bitter rivals Swansea at the Liberty Stadium thanks to Aden Flint's early goal.
Flint has now scored more goals in English League football than any other defender since August 2014 and his 38th effort in that time gave Cardiff their first derby win since 2013, as he headed home in the eighth minute.
Success for the Bluebirds means neither Swansea nor Cardiff have ever done the derby double in the same season. Swansea had been 2-0 winners at Cardiff City Stadium earlier in the campaign.
Cardiff, meanwhile, were without in-form right-back Perry Ng.
Hourihane stepped up and curled a free-kick towards goal which Dillon Phillips tipped wide for a corner. Cardiff responded by taking the lead from a trademark set-piece.
Swansea's eagerness to play out from the back was being tested by Cardiff's impressive pressing and Leandro Bacuna forced Woodman into action again from an away counter-attack.
Swansea's strife was not improved by them losing key man Hourihane who had initially tried to run off a thigh muscle injury. Korey Smith was the man to come on.
The pace of Swansea's game improved at the start of the second period and Whittaker had a shot saved. Andre Ayew was then fouled on the edge of the box by Vaulks to earn a home free-kick.
Ayew curled the resulting effort wide, with Phillips unbothered.
Whittaker also blazed over when he should have at least hit the target, while at the other end Woodman denied Harry Wilson on another counter. Wilson had been quiet to that point.
Ayew came within inches of levelling the scores when his header from a Connor Roberts corner beat Phillips but not the post.
Swansea introduced Lowe and Ryan Manning and switched to a back four in search of an equaliser, but although they dominated the ball, they could not break through.