Ireland were crowned Grand Slam champions of Europe in Cardiff six years ago - and Wales star Jamie Roberts says he will never forget it.
Roberts opposes Ireland for an eighth time during his 68-cap Wales career on Saturday, with the stakes again high.
Defeat for Wales at the Millennium Stadium will end their title hopes, while an Ireland triumph would leave them needing victory over Scotland to secure a second successive Six Nations crown.
"When you always come up against the Irish, there is always kind of that edge to it," Wales centre Roberts said.
"We are good mates off the field, and certainly on the field down the years there have been some great games. On a personal note, though, there have been more lows than highs against them. That is something I am quite keen to rectify.
"I remember the quarter-final of the (2011) World Cup and 2012 (Six Nations) as very good memories, but I will never forget 2009 (Roberts was a first-half replacement for full-back Lee Byrne) watching Ireland win the Grand Slam in our stadium.
"That is one of those moments in your career that drives you and motivates you I suppose. It's something you never want to happen again. And certainly the last two years, playing at home in 2013 we got blown off the field in the first-half, and last year it wasn't pretty, it was a poor loss out there (in Dublin)."