Scarlets battled through terrible conditions and a Zebre comeback to finally win 20-12 at Parc y Scarlets.
Scarlets coach Wayne Pivac has made 10 changes to his side for Sunday's visit of Zebre in the Guinness PRO12.
There were wins for Sale and Connacht in the Challenge Cup on Saturday while London Irish lost away to Grenoble.
World Cup winner Ben Franks could make his London Irish debut in Saturday's Challenge Cup trip to Grenoble.
All the team news ahead of Saturday's Challenge Cup matches, including London Irish v Agen and Gloucester v Zebre.
Eli Walker scored two tries as Ospreys secured a much-needed 36-3 bonus-point victory over Zebre at the Liberty Stadium.
Steve Tandy has demanded a much-improved performance from his Ospreys side when Zebre visit the Liberty Stadium.
Zebre claimed their second PRO12 victory in as many weeks after a 26-15 bonus point triumph over Cardiff Blues.
More of the games that matter on Sky Sports
Rugby Union news, direct to your mobile
A Day Pass for only £6.99. No contract
Win in our free to enter competitions section
We've a host of top class rugby union action