Ulster responded to two weekends of European disappointment with a 23-6 victory against Newport Gwent Dragons.
Steven Shingler scored 23 points as an understrength Scarlets recorded a 28-13 victory over Zebre at Parc y Scarlets.
Nikola Matawalu scored the only try of the match as in-form Glasgow claimed a hard-fought 17-9 victory over Treviso.
Ospreys maintained their unbeaten record in the PRO12 with a comfortable 26-11 win over Connacht at the Liberty Stadium.
Leinster recorded back-to-back league victories for the first time this term with a 33-8 win over Edinburgh at the RDS .
Cardiff Blues host Munster in Sky Sports live fixture, Ulster take on the Dragons while Scarlets entertain Zebre.
Table-toppers Ospreys host Connacht on Friday looking to make it seven wins on the bounce in the Guinness PRO12.