Parc des Sports Marcel Michelin, Clermont Ferrand
Biarritz will breathe a massive sigh of relief as the climb up to tenth in the standings with their third consecutive win.
The result leaves Clermont one point short of the championship lead and USAP teetering on the edge of the relegation zone.
Biarritz took a step towards safety with victory in Lyon on Saturday while Perpignan slipped closer to the drop zone despite claiming a losing bonus point in Clermont.
But in the end David Skrela's boot won the day for the hosts as he landed eight penalties.
Adrien Plante touched down to level matter early in the second half but Skrela kept the scoreboard ticking.
Clermont were made to work very hard to retain their unbeaten record at home (their 40th successive win at their fortress) against a combative Catalan side that are fighting for their Top 14 lives.
Lyon Olympique 17 34 Biarritz Olympique
A late penalty from James Hook secured a vital losing bonus point for USAP, who face a relegation showdown with Bayonne next week.
from full back Joffrey Michel to leave the scores at 17 13 to the home side.
"I am satisfied, especially by our tactics," said Clermont coach Vern Cotter.
Clermont Auvergne v Perpignan
Clermont took their opportunity despite a bruising start that saw their prop Lionel Faure and Perpignan hooker Charles Geli both yellow carded for a second minute punch up.
Alex Tulou's try proved too little, too late for Montpellier, who head home empty handed.
Castres ended a three game winless streak thanks to a great defensive effort to regain fourth place (synonymous with a home play off) from their visitors.
Romain Martial's touchdown early in the second period gave CO a healthy lead despite struggling at scrum time.
ASM Clermont Auvergne 29 23 USA Perpignan
most of the playing but failed to turn their territorial domination into points at crucial times.
Alexandre Lapandry scored early for Clermont but the hosts replied with a try Omega Seamaster Cosmic 2000 History
Stade Matmut, Lyon
Perpignan were far cry from the side that has struggled all year and were rewarded with two tries for their aggression at the breakdown zone.
Montpellier did Omega Speedmaster White Face
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Castres led 14 5 at half time thanks to a Marc Andreu try from turnover ball. Lucas Amorosino replied almost immediately for Montpellier but Romain Teulet's boot ensured the hosts held the advantage at the break.
"It was important to have that sort of commitment ahead of our European Cup quarter final tie."
USAP gave their hosts a real run for their money but ultimately paid for their indiscipline.
to take a step closer to a home play off.
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