Each Heineken Cup weekend on Sky Sports, rugby commentator Miles Harrison choose the plum tie from Friday, Saturday and Sunday's action, and this Saturday he says it will be a case of sweet revenge for Saracens at home to Ulster.
There are some big games on Saturday, what attracted you to this one?
MILES: Sky isn't showing Cardiff v Calvisano live this week but the Blues have sold all their tickets for this game already and have now increased the capacity at the Arms Park.
We all know why. It would have happened
regularly a few years ago, but the crowds have gone away from the Blues in recent seasons. They are trying to build them up again, and they are doing a great job of that.
Jonah Lomu signing is a great story for the Blues and for the competition. There is no doubt that he needs time but he is still a great draw for the crowds.
Saracens at home to Ulster though has been set up beautifully by the result in Belfast last weekend.
We billed Ulster v Saracens as shoot out last week, and it is even more than that this week because of Biarritz took care of buinsess in Treviso, getting the bonus point and scoring some beautiful tries.
Biarritz are slowly cranking it up and I expect them to win in Treviso this weekend, although they will have to work for a win, and that makes this game the crux of this group.
It is that important?
MILES: It should determine who will have a shot at Biarritz to get out of this group in the final weeks.
Will it be Ulster at Ravenhill on the final day of the pool stages or will Sarries be travelling to Biarritz in round five for a play off game?
Do Ulster have the momentum after their late win last weekend?
They have to follow up last Friday's win with another one if they want to be champions again, as they were in 1999.
The sad thing for Ulster is their dreadful away record in England in European competition.In seven trips to England, they have lost them all. In five of those matches they have lost by 30 or more.
It is a damning stat. They have to do a job at Sarries and may take heart that they didn't play well at Ravenhill last weekend, albeit in filyhy conditions, but won in the end.
Saracens though will be thinking they had a great chance to do be competing a double this weekend. Well, now they have to win too and this is a mini Cup final.
And a prediction?
MILES: I think Ulster will play better than they did last Friday night, but I don't think it will be enough to win. Saracens last weekend had an air as if they had missed the boat.
It was only in last 10 that they lost the game. Steve Diamond was right, for 65 minutes there really was only one winner. But then came the yellow cards and the lack of discipline and in the end they missed out on the bonus point. It couldn't have gone worse. With little to choose between the two teams maybe that incentive, of putting right what went wrong last Friday, will swing it towards Saracens.
Ulster too have their do-or-die incentive, and I wouldn't be surprised if there is only one score in it and I will go wityh home advantage
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This Sunday Miles will be in Swansea for a mouth-watering tie Anglo-Wlesh tie between Ospreys and Tigers.
Why this game?
MILES: We saw a very entertaining game between these two teams last weekend.
I was at Stradey watching Scarlets and Wasps but I don't think we had the same invention that was at Welford Road. Certainly early on as the Ospreys cut through and Gavin Henson will be kicking himself. Perhaps that chance came to him too early after a long break.
It was a good game and the Ospreys, although they lost heavily, will look back and think we were favourites to win at half-time, or had at least given ourselves a chance of victory.
Can the Ospreys reverse last week's result?
MILES: They won't think of this as anything other than a chance of a big win. The only worry is if they they think they can't qualify for the playoffs - their chances are slim but they won't have thrown the towel in - and I don't think that will take the edge off this game.
They showed enough in the first game to say they will cause Leicester, who have played rotten rugby and great rugby this year, some problems.
And there is also the England v France aspect that will motivate them. It was there last week in Llanelli and although it hasn't always been there in the Powergen Cup this season as deep down the clubs are not yet convinced by the nature of that competition, everyone is convinced by the Heineken Cup.
The Wales v England nature will be enough to create an atmosphere and the Ospreys will hope to produce a performance to match.
I am really looking forwards to going back to Swansea, it was a terrific day for them against Stade Francais, and an unexpected result. I look forwards to feeling the same atmosphere again.
And a prediction?
MILES: Leicester to win because in the final 15 minutes at Welford Road they showed they had learned how to win there and how to go and win 'game two'.
And also Leicester because they have their noses in front in terms of qualification and will see this game a must-win to set up Stade Francais in round five as a possible decider for the pool. Their experience could prove too much too.
I say this with no great confidence though because if the Ospreys click, they have high quality players in their line-up and they won't lack for effort. It was too much for Stade and it might be too much for Tigers. I expect a close battle again with barely a wafer between them.