Rhys Webb crosses the whitewash for the Ospreys© Photo by Stu Forster/Getty Images

Ospreys earned a significant 21-10 victory over Glasgow at the Liberty Stadium to displace the Scottish side at the top of the Guinness PRO12 table with one game of the regular season to play.

If the Welsh team hold on to one of the top two places after their final game in Connacht next weekend, they will secure a home draw in the play-off semi-final. Both teams had already secured their places in the end-of-season play-offs.

Ospreys, who had not beaten Glasgow in their seven previous attempts, were indebted to tries from centre Ben John and scrum-half Rhys Webb. Glasgow's try came from flanker Chris Fusaro.

Leinster qualified for next season's European Champions Cup with a 10-0 win over Benetton Treviso at the RDS Arena, but their lacklustre performance will do little to quieten critics of head coach Matt O'Connor.

On a night when the home fans paid tribute to the retiring Shane Jennings and Gordon D'Arcy, O'Connor's men struggled to see off second-from-bottom Treviso in the Dublin rain.

Jamie Heaslip's eighth-minute converted try was the only score of a drab first half, with rival place-kickers Jayden Hayward and Ian Madigan missing one penalty apiece.

The Irish province showed a distinct lack of accuracy and urgency in front of a subdued 11,322 attendance, and the result was only sealed by a 77th-minute penalty from Jimmy Gopperth.

The out-half's clinching score came just moments after referee Leighton Hodges red carded Edoardo Gori for a dangerous tackle on D'Arcy and a subsequent incident at a ruck saw Sean O'Brien and Treviso's Francesco Minto both sin-binned.

Despite the forgettable showing, this round 21 victory, coupled with Newport's defeat of Edinburgh, means last year's league winners are guaranteed a top-six finish and a 2015-16 Champions Cup berth.

Edinburgh could have blown their chance of a top six finish after a lacklustre display was punished by the Dragons at Rodney Parade.

They needed to win in Newport but could only muster one solitary try at the end from flanker Stuart McInally and did not come close to scoring until they woke up near the end of their 19-5 defeat.

The Dragons were not that pretty either but they got points on the board through a second-half try from replacement hooker Hugh Gustafson, plus three penalties and a conversion from fly-half Jason Tovey and a long-range penalty by full-back Tom Prydie.