Ian Madigan kicked seven penalties to hand Leinster a 21-16 win over Castres and make it two wins out of two in the European Champions Cup for the Irish side.
After an early Saimone Taumoepeau try, Madigan struck three first-half penalties to make it 9-7 at the interval.
However, three penatlies from Geoffrey Palis put the home side seven points ahead before a flurry of Madigan kicks secured the win for Leinster.
The result leaves Leinster top of Pool Two ahead of Wasps' clash with Harlequins this afternoon.
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