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(Stade Jean Dauger, Friday, April 1 - kick-off 7.30pm)
Bayonne are looking for a title in their first season of European football, while Auch are in their second season after falling at the Pool stages in 2000-01.
Bayonne prop Jeremy Tumuli will be anchoring the home side at an impressive 21 stone, while Auch outside-half Yannick Lafforgue is a dangerous goal-kicker.
WORCESTER WARRIORS v LEEDS TYKES
(Sixways Stadium, Saturday, April 2 - kick-off 2pm)
England are guaranteed to have a Shield finalist, but it would take a brave man to name them.
Worcester are fighting for survival in the Zurich Premiership, but have impressed neutral fans with some brave performances this season, and are keen for some silverware in their first season in Europe.
The Tykes will probably be slight favourites for the two-leg semi-final, and coach Phil Davies will be hoping Argentina winger Diego Albanese continues his fine try-scoring form.
