The Ospreys moved back up to second in the Pro12 table by running out 10-0 winners against Newport Gwent Dragons at Rodney Parade.
Ospreys started 2017 with a victory thanks to a try by Wales flanker Justin Tipuric and five points from the boot of international team-mate Dan Biggar, and sit two points behind leaders Munster.
The Dragons headed into the game in 10th place and on a run of five straight wins in all competitions in Newport but couldn't cause an upset despite the tricky conditions being something of a leveller.
Meanwhile, Steff Evans scored one try and created another as Scarlets claimed an important 15-10 derby victory over Cardiff Blues to regain fourth place.
Scarlets' two tries came from Evans and skipper Scott Williams, with Rhys Patchell providing a penalty and a conversion.
Blues, who claimed a losing bonus point, were indebted to a fine try from centre Willis Halaholo in the second half, converted by Steve Shingler.