There is plenty to play for as we enter the final pool games this weekend, with 15 clubs still on the hunt for a place in the last eight of the Champions Cup, while the Challenge Cup offers redemption for teams who have had a disappointing season so far.
ESPN's experts predict which teams are set for a big weekend, which players will shine and where your attention should be trained across the two competitions.
Player to watch
Champions Cup (Cillian O Conchuir): The uncapped seven. With the Six Nations just around the corner, this week's game present Eddie Jones with a chance of seeing seven of the eight uncapped players in his squad playing high-level Champions Cup rugby. It is a huge opportunity for the likes of Alec Hepburn, Tom Dunn, Zach Mercer, Marcus Smith and Harry Mallinder to show they can handle the big stage.
Challenge Cup (James Harrington): Tony Ensor. After a slow start, defending champions Stade Francais have dragged themselves back into something approaching contention for a quarter-final place. They'll need to pick up five points at home against the already qualified Edinburgh -- and that means they'll need fullback Ensor, who joined from Otago last summer and is already a firm fan favourite at Stade Jean-Bouin, at his free-running best.
Game of the weekend
Champions Cup: Scarlets vs. Toulon, Saturday, 5.30pm
Nobody imagined Scarlets would be in control of their own destiny going into the final round. But here they stand, on the cusp of their first quarterfinal appearance in the Champions Cup for 10 years. A defeat for Toulon could have catastrophic repercussions for Mourad Boudjellal's side. Leigh Halfpenny is fit for Scarlets and could orchestrate the downfall of his former side who have Mathieu Bastareaud suspended in a winner-takes all encounter.
Challenge Cup: Gloucester vs. Pau, Friday, 7.45pm
Six points separated the two sides in a 27-21 Pool 3 thriller back in October. Now, with the small matter of a home quarterfinal to play for, two sides that have already booked their place in the last eight go head-to-head once again. The Top 14 side have won both their Challenge Cup matches on the road, following a run of 12 defeats. But the Cherry and Whites have won their last 15 home matches in the competition. Something has to give. A home quarterfinal awaits the victor, while the loser is likely to finish as the highest-ranked runner-up.
Potential upset
Champions Cup: Clermont vs. Ospreys, Saturday, 3.15 p.m.
The last time two Welsh teams made the quarterfinals was nine years ago and Ospreys will have to dethrone one of the powerhouses of European rugby, in their own backyard, to keep that hope alive. Ospreys currently sit eighth in the standings, level on points with Racing 92, but victory in France will secure a place in the last eight. They are up against an injury-plagued Clermont side who have never lost at home against a Welsh team.
Challenge Cup: Dragons vs Bordeaux, Saturday, 3pm
It's win or bust for both teams, as they look to bag a best runners-up spot and sneak in to one of the two remaining quarterfinal spots. In three previous meetings between the two sides, the home team has taken the spoils. But, with that shiny last-eight berth the prize, expect the visitors -- under new boss Rory Teague -- to come out with all guns blazing at Rodney Parade.
Big weekend for...
Champions Cup: Saracens. A third straight year as Champions Cup winners is out of their control now, as they sit third in their group and sit eleventh, and two points off the last qualifying spot for the last eight. Injuries haven't helped, but Mark McCall will want to end the campaign on a high. With the Six Nations around the corner, it provides extra impetus for their international contingent to lay down a marker ahead of the tournament.
Challenge Cup: Worcester. And Brive. And Stade Francais. And Sale. And Bordeaux. And Dragons. And London Irish. It's the hope that makes the final round of pool matches so nerve-racking. Six quarterfinal slots are taken, but two remain vacant -- and seven clubs in four of the five pools have a mathematical chance of grabbing one of them. Some, like Bordeaux, hold their Challenge Cup future in their own hands. Others, like Sale, need help from elsewhere. Either way, glory is up for grabs, and all seven will be out for a slice.