Leinster have come away from Castres with a massive 21-16 win in Pool 2 of the European Champions Cup.
But the Boys in Blue got off to the worst possible start.
Castres bundled over the line for the opening try after just five minutes, as Ortega touched down after a maul from a line out.
But Leinster responded with lots of patient build up play that was rewarded by three first half penalties from Ian Madigan, as Leinster led at the break 9-7.
The hosts soon led 16-9 as they converted three penalties of their own.
But the Boys in Blue kept their cool, and earned four penalties in the final 15 minutes, which were all converted by Madigan.
Leinster now have 8 points from their opening two games in Pool 2.
