Table-toppers Ospreys host Connacht on Friday looking to make it seven wins on the bounce in the Guinness PRO12.
Jonathan Sexton kicked 16 points as Racing Metro defeated Benetton Treviso 26-10 in the European Rugby Champions Cup.
The second round of action comes to a climax at the Stadio Comunale di Monigo, where Benetton Treviso host Racing Metro.
Ospreys opened their European Champions Cup campaign with a crushing 42-7 victory over Treviso at Liberty Stadium.
Dan Biggar wants the Ospreys to travel "full of confidence" when they tackle Northampton next Saturday.
High-flying Ospreys host Benetton Treviso in the European Rugby Champions Cup on Sunday aiming to win again.
Connacht got their Pro12 campaign back on track as Craig Ronaldson kicked three penalties in a 9-6 win over Treviso.
Guinness PRO12 leaders Glasgow Warriors put their unbeaten record on the line when they travel to face Ulster.
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