Barnsley conceded the first goal for the 20th time in 35 Championship games this season, more than in 46 games in 2016-2017 (18)
They last conceded the first goal as many as 20 times in 46 games in the promotion season of 2015-2016.
Oli McBurnie has now scored five goals in six appearances for Barnsley, making him the club's joint second top scorer in 2017-2018.
The on-loan Swansea striker is the first Barnsley player to score in three successive games since Tom Bradshaw against Morecambe, Ipswich and Nottingham Forest in August.
McBurnie has also scored five of Barnsley's last six goals.
He has scored a goal every 86 minutes and nine of his 13 shots have been on target (69%)
Cardiff's Callum Paterson scored in both meetings with Barnsley this season - he is the first player to score in both Cardiff/Barnsley matches since Peter Whittingham in 2008-2009.
Paterson is the first player from any club to score in both league matches against Barnsley since Dwight Gayle for Newcastle last season.
Cardiff complete a league double over Barnsley for the first time since the 2011-2012 season - it is only the second time in the last six seasons the two teams have met that they have achieved it.
Cardiff have though now lost only one of their last ten league matches against Barnsley (W6 D3)
The last four Championship matches between these sides at the Cardiff City Stadium have produced 20 goals (11 for Cardiff, eight for Barnsley).
The victory was the Bluebirds fifth successive Championship triumph, and the first one in this run in which they have conceded a goal.
McBurnie's strike was also the first league goal scored by an opponent at the Cardiff City Stadium in 2018, the only other opposing players to score there so far this calendar year are Kevin De Bruyne and Raheem Sterling.
Remarkably NONE of the bottom half teams won on Tuesday night.
Barnsley had 61% possession in the match, their highest away from home this season.
Christoph Knasmullner (for Gardner 45)
Ryan Hedges (for Thiam 75)
Tom Bradshaw (for Potts 87)
Adam Davies, Dimitri Cavare, Connor Mahoney, Matty Pearson.
Neil Etheridge, Matthew Connolly, Bruno Manga, Sol Bamba, Joe Bennett, Callum Paterson, Marko Grujic, Craig Bryson, Junior Hoilett, Kenneth Zohore, Kadeem Harris.
Greg Halford (for Grujic 56)
Loic Damour (for Paterson 62)
Nathaniel Mendez-Laing (for Harris 70)
Liam Feeney, Anthony Pilkington, Brian Murphy, Yanic Wildschut.
Cardiff manager Neil Warnock said:
"I said the last 20 minutes would define our season because they had their tails up and we were all at sea.
"I have a great bunch of lads. I can't fault the effort. But people can't ever accuse our team of being physical after what we have seen.
"I was more disappointed at some of the things (that were) allowed to happen but it's another three points and we move on. It's a disgrace, how Kieffer Moore has not been sent off for two challenges I do not know. So, I'm extra pleased that we have stood up to that.
"We missed some easy chances that my wife could have put in."
Sky Bet Championship results:
Tuesday 6th March 2018:
Birmingham 0-1 Middlesbrough
Burton 0-2 Brentford
McFadzean og 60, Watkins 80
Cardiff City 2-1 BARNSLEY
Paterson 31 McBurnie 60
Fulham 3-0 Sheffield United
Hull City 1-2 Millwall
Hernandez 79 Saville 1, Cooper 33
Norwich City 0-0 Nottingham Forest
Preston North End 2-1 Bristol City
Browne 20 Diedhiou 67
Queens Park Rangers 1-1 Derby County
Luongo 87 Weimann 38
Sheffield Wednesday 1-2 Ipswich Town
Joao 69 Waghorn 51, 83
Sunderland 0-3 Aston Villa
Grabban 34, Chester 45+3, Oviedo og 66
Reading 1-1 Bolton Wanderers
Barrow 32 Le Fondre 45
Wednesday 7th March 2018:
Leeds United 0-3 Wolverhampton Wanderers
Saiss 28, Boly 45, Afobe 74
Barnsley lie in 21st place in the Sky Bet Championship with 32 points from 35 games.
We are 26 points outside the Play-Offs, 38 points off the Automatic Promotion Places, 44 points off First place and 2 points above the Relegation Zone.
Up to 08/03/18
On The Road:
Sky Bet Championship Matchday Thirty Six: Middlesbrough v Barnsley: Saturday 10th March 2018. Kick-Off: 3pm
Sky Bet Championship Matchday Thirty Seven: Barnsley v Norwich City, Tuesday 13th March 2018. Kick-Off: 7:45pm