Springbok scrumhalf Ruan Pienaar inspired Ulster to top position in Pro 12, Neil de Kock took Saracens to top place in the English Premiership and Danie Rossouw scored twice for Toulon in France’s Top 14.
Rossouw’s effort and the 43-21 win wasn’t enough for Toulon to finish the Top 14 in first place. Europe’s wealthiest club settled for second behind Clermont who won for a record 60th consecutive time at home.
Rossouw, Bakkies Botha and Joe van Niekerk all started in the win against relegated Agen.
In the French Top 14 the final is always played at the Stade de France so semi-final home ground advantage is only applicable for the teams finishing one and two. To this end Touloun have achieved their season’s aim.
Toulon and Clermont will already meet in the European Cup final later this month and both have the chance to win the domestic and European double.
Saracens were easy winners against Bath, for whom former Bok Michael Claassens played his final match.
Claassens has been linked with a move to Toulon to join new recruits Bryan Habana and Drew Mitchell.
Rory Kockett scored 15 points Castres’s one point defeat at Racing Metro and currently is second only to Jonny Wilkinson for most points scored this season. Kockett has scored over 300 points.
Saracens, beaten by Toulon in the European Cup semi-finals, will host their Premiership semi-final.
Should they win then the final will be 2007 World Cup-winning captain John Smit’s final match.