There were many low points for Ireland in 2019, but being effectively nilled in Cardiff stands out.
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Jordan Larmour's 83rd-minute try at least removed the big, fat zero from the Principality Stadium scoreboard but Wales were already celebrating a Grand Slam as Ireland dealt with another blow to their confidence.
Their belief has never recovered from their opening day defeat against England and the losses to Wales, England again, Japan and New Zealand kept denting any chance of a return to form.
They say the past is behind them, but it is now 15 months since they beat an opponent ranked above them in a competitive game.
The personnel remain from their glorious 2018, but there are now major questions over the same players' ability to deliver when it matters at the top level.
Today will tell us a lot about Ireland in 2020 and the direction of travel under Andy Farrell.
The new coach, his staff and players have talked about the fresh, inclusive approach they have taken.
Yet, this is effectively the same team. Rory Best is retired, Rob Kearney is dropped and there are a couple of new faces among the replacements but the starting XV is a very familiar one.
A defeat would be damaging to Farrell who has put trust in this group of players despite their form.
None of the starters are bad players, all of them have delivered for Ireland in the past yet collectively they have struggled for so long it is almost impossible to expect much from them today.
At home to Scotland last week in their first game since a devastatingly disappointing World Cup exit, they couldn't win collisions and needed desperate goal-line defence far too often.
Their commitment is not in question, but a better team would have beaten them.
Wales are a far superior outfit than the Scots.
The reigning champions and World Cup semi-finalists, their new coach has a confident set of players who will believe they can end their long wait for a victory at this venue.
Home advantage has been pivotal in this fixture and Ireland will be hoping the crowd get in early and get behind them despite the 2.15 kick-off and the expected bad weather.
Storm Ciara will unsettle both teams and introduce a degree of luck to proceedings.
There will be dropped balls and plenty of scrums. The lineout could be a lottery, passing will be risky business.
So, it could come down to commitment and resilience.
Both teams struggled at scrum-time last week, but Ireland will fancy their chances of getting ahead on that count.
Rob Herring and Ken Owens face a major challenge in finding their men out of touch, while the kickers will have difficulty gauging the squally winds.
It's set up for a fight and the question is whether Ireland have the weapons to win.
Without Caelan Doris, their back-row looks imbalanced. CJ Stander will run into red jerseys all day, but the Welsh will lap that up.
Outside of Johnny Sexton, Bundee Aki and Robbie Henshaw will carry willingly but the outside backs may not see too much ball.
Wales want to play with more width under Wayne Pivac, but that goes out the window in these conditions.
If it comes down to the tight five, then Ireland have the edge.
Wales have the better back-row, the half-backs are evenly matched and while Ireland are the more powerful centres, the Welsh pair are possibly more creative.
There is not much between the back-threes who can expect to spend a lot of time taking high balls out of the sky.
In reality, Ireland's campaign is already on the line. With trips to England and France to come, they must win their home games to have a hope of going into the final weekend with a chance of winning the tournament.
The stakes are high for Wales as well. They welcome France to Cardiff next up, before going to Twickenham. Winning here unlocks their season.
It's the type of match Ireland lost last season.
Given the conditions, it is unlikely to be pretty and their attacking enhancements may have to wait.
After a stuttering start, there are plenty of questions hanging over the squad and management but a win of any hue would give them some breathing space.
At home, in these conditions, they might just have enough.