Ireland are in Cardiff to face Wales in a game that will go a long way to deciding the destination of this season's Six Nations championship.
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Jamie Heaslip is restored to number 8 after recovering from injury, while captain Paul O'Connell earns his one-hundredth cap.
Despite becoming Ireland's latest centurion, O'Connell insists the hunger is still there.
The roof will be open at the Millennium Stadium, where kick-off is at 2.30.
Following that, it's the Calcutta Cup clash of England and Scotland at Twickenham, where there's a 5pm start.
In the Women's Six Nations Italy take on France at 5.
