Pro12 semi-final will be won mentally - Ruan Pienaar

Ulster's Springbok scrum-half Ruan Pienaar says Friday's Pro12 semi-final against Leinster in Dublin "will be won mentally".

"It will be a tough challenge to go to the RDS and face a quality team but we can take confidence from the winning run we have put together coming into this game," said Pienaar.

"We have made a lot of mistakes against Leinster in play-off games in the past. That has allowed them to put scoreboard pressure on us and we ended up chasing games.

"We must be better in our discipline, make good decisions, and, when chances come along, take them."