PARIS (AFP) - Top 14 high fliers Clermont and Castres both notched up wins in French first division action on Saturday.

With defending champions Perpignan playing Biarritz in a late game, Clermont moved atop the league - at least temporarily - with a bonus-point 38-13 victory over Bayonne.

Fijian winger Napolioni Nalaga bagged a brace in the four tries to one win, Australian Brock James proving his metromonic self at outside-half.

Castres moved into second after edging a 21-19 thriller against Toulon.

Jonny Wilkinson, aiming for an England berth in next month's autumn internationals, was outgunned by the home side's full-back Romain Teulet and Kiwi outside-half Cameron MacIntyre.

Wilkinson scored three penalties, a drop goal and converted Steve Kefu's try, but Teulet nailed five penalties and MacIntyre hit two drop goals to seal a victory for the home side.

Fourth-placed Toulouse registered a 30-12 win over Montpellier, a result that left the latter in trouble one spot off the foot of the table.

Byron Kelleher made his return at scrum-half for Toulouse after his time on the bench following a shoulder injury sustained in a drink-fuelled scuffle sparked by a road accident.

Toulouse overcame the first-half sin-binning of the former All Black, having scored three tries in the first 16 minutes through Florian Fritz, Vincent Clerc and ex-Montpellier No 8 Louis Picamoles.

Jean-Baptiste Elissalde contributed 15 points with the boot.

Racing-Metro moved into mid-table comfort with a 17-12 win over Montauban, while fellow Parisian side Stade Francais handed Brive a 44-16 thrashing on Friday.

Racing coach Simon Mannix said: "The most important thing is that we got the four points. We were a bit frustrated at the end after having started the match well."

Mannix was left with some injury concerns, however, that could affect selection ahead of next weekend's European Challenge Cup first round game against London Wasps.

No 8 Sebastien Chabal was to undergo tests on a knee injured in a maul that saw him taken off the pitch. Outside-half Andrew Mehrtens also injured his sternum and requires further examination.

Saturday's other late game sees Bourgoin hosting Albi.