Westerman converted all four of Castleford's tries
Joe Westerman's boot proved crucial as Castleford edged out Catalans Dragons in a tight encounter at The Jungle.
Westerman converted all four of his side's tries, while William Barthau only added the extras to two scores.
Castleford led 12-10 at the break through two Steve Snitch tries, which were sandwiched by efforts from Casey McGuire and Sebastien Raguin.
Frederic Vaccari then put Catalans ahead, but Michael Wainwright's brace meant Vaccari's second was not enough.
Castleford's victory ended a run of three straight defeats, but came at a cost when England centre Michael Shenton was carried off with a leg injury just before the hooter.
They now them move to within four points of the play-off places, while the rock-bottom Dragons have now lost nine successive Super League games.
Cas, who had twice beaten the visitors already this season, in Perpignan and Edinburgh, made hard work of it, despite Catalans including 10 of the players who turned out for France in Saturday's 60-6 defeat by England.
They even fell behind in only the fifth minute when McGuire, back from a month's lay-off with a calf injury, forced his way over, Barthau's conversion attempt hitting the post.
He did convert Catalans' second try after Raguin took Setaimata Sa's pass and held off Dean Widders to score, but by then they were behind through Snitch's double, both following Rangi Chase passes.
The Dragons did force their way back in front when Vaccari crossed unopposed following former Cas scrum-half Brent Sherwin's long pass.
But their lead only lasted five minutes as winger Wainwright claimed Chase's high kick to score his first, before capitalising on Snitch's break for his second.
Catalans had the final say through Vaccari, but it was too late to deny Cas victory, some of the gloss of which was taken off with Shenton's injury.
Castleford coach Terry Matterson: "We don't know how bad it is yet but 'Shenny' doesn't stay down.
"He's a tough kid but it doesn't look very promising.
"It left us with 12 men and it was a pretty nervy last minute but we got there.
"I thought their goal-line defence was very desperate. You've got to give them credit - they played some good rugby.
"We've got some people doing a fair job for us out of position. Brett Ferres is playing for us in the centres, young Kyle Wood is doing a job for us at dummy half and we've got Dean Widders playing at stand-off so we're mixing and matching."
Catalans coach Kevin Walters: "We've got some bruised bodies in there, probably more so than the Test. It was a physical game.
"You can't fault their effort again. They were very good backing up from Saturday. If we play like that every week, we are going to win more than we lose.
"I thought a few things didn't quite go our way in the second half. There were a couple of times when we maybe could have got over the line but then they scored that soft try.
"You have got to score points when you're on top and we didn't manage that in the second half."
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