Top 14 round-up: Jonathan Sexton is unused substitute as Racing Metro lose to bottom side Biarritz Jonathan Sexton was an unused substitute as his Racing Metro side suffered a shock 9-6 defeat to bottom side Biarritz. The Irish fly-half, who returned to Paris from his international camp in order to sit on the bench for his club side, will now rejoin his compatriots as they prepare for their autumn international against Samoa on Saturday. It had been rumoured that if Sexton had played against Biarritz, Joe Schmidt, the Ireland coach, would have been forced to leave the outside-half out of the international side after describing him as "pretty tired" and "pretty flat." Without him, Racing let a 6-0 half-time lead slip as Frenchman Dimitri Yachvili kicked three second-half penalties to give his side their first win in nine Top 14 matches. The victory for the Basque side was not enough to close the gap on the teams above them, however, after Oyonnax picked up a crucial 22-9 victory over Perpignan. Welshman James Hook kicked three penalties for the visitors but they were undone as a try from Silvère Tian 13 minutes from time helped Oyonnax record their fifth home victory of the league season. The result keeps them in 13th place level on points with both Bordeaux-Bègles and Bayonne. The latter picked up three second-half yellow cards as they were beaten 13-9 at Stade Francais, while Bordeaux-Bègles went down 37-17 to Toulon. A try from Delon Armitage added to earlier scores from Matt Giteau and Ali Williams and helped the reigning European Champions regain top spot in the process. Jonny Wilkinson, who missed several opportunities with the boot in last week's narrow defeat to Toulouse, kicked 22 points as his side maintained their 100 per cent home league record and now lead the Top 14 standings from Montpellier on points difference. Fabien Galthié's Montpellier beat Grenoble 25-18 in a game which included one try - from Mamuka Gorgodze - two yellow cards and one red card for Grenoble's Vincent Campo. Irish scrum half, James Hart, kicked 15 of the visitor's 18 points as they suffered their first league defeat in five matches. Elsewhere, a second-minute try from Guillaume Ribes helped Brive overcome Toulouse 25-13. Frenchman Yoann Huget replied for the visitors late on with a try but it was not enough to prevent his side from slipping to their fifth league defeat of the season and drop to fourth in the Top 14 standings. Meanwhile, Castres and Clermont shared the spoils after their match finished in a 22-22 draw. A penalty seven minutes from time from Rory Kockott added to his earlier try and helped his side to maintain their unbeaten home record in this year's championship. For Clermont, the result means they are still without an away league victory all season. To make matters worse, their Welsh full-back, Lee Byrne, had to be replaced after suffering an injury, a fortnight after he was overlooked by Warren Gatland for his country's QBE internationals and claimed Wales are not picking players on form.