The Ospreys guaranteed themselves a home Magners League semi-final with a rampant 42-10 win over the Dragons on Friday.
The hosts saw off their Welsh regional rivals by five tries to one with skipper Ryan Jones, Dan Biggar, who scored 22 points, Nikki Walker and Ryan Bevington adding to a first-half penalty try which highlighted the Ospreys' dominance up front.
The home side fielded 15 full internationals in their starting line-up, while the depleted Dragons had 14 players out injured including openside flanker Gavin Thomas, who pulled out of the side before the kick-off.
Despite having an obvious edge up front the Ospreys only managed the one try in the first half, which they led 16-3.
But Ospreys started impressively and when putting it through the hands they looked too dangerous for the inexperienced Dragons.
Ospreys put the Dragons on the back foot with Biggar kicking penalties after five and eight minutes.
British Lions wing Shane Williams looked as if he was going to score the first try but he was ushered impressively into touch by Dragons full-back Will Harris.
When it did come the Ospreys try arrived courtesy of the forwards. After three five-metre scrums the Dragons conceded a penalty try converted by Biggar.
Biggar and his opposite number Jason Tovey swapped penalties in the space of two minutes but
the remaining 12 minutes of half were forgettable as the Ospreys chose to get embroiled in a kicking game rather than put it through the hands.
The Ospreys forward dominance was evident nine minutes into the second half when Ryan Jones went in for a pushover try.
A poor line-out from the Ospreys allowed the Dragons to pounce for their only try, which was scored by scrum-half Wayne Evans.
And with prop Aaron Coundley in the sin-bin for continual collapsing of the scrum the Ospreys scored two more tries for Biggar, who finished off an impressive counter attack, and Walker.
The icing was put on the cake five minutes from the end when replacement prop Bevington went over in the left corner.
For the Ospreys:
Tries: Penalty try, Jones, Biggar, Walker< Bevington
Cons: Biggar 4
Pens: Biggar 3
For the Dragons:
Ospreys: 15 Lee Byrne, 14 Tommy Bowe, 13 Andrew Bishop, 12 James Hook, 11 Shane Williams, 10 Dan Biggar, 9 Mike Phillips, 8 Ryan Jones (capt), 7 Marty Holah, 6 Jerry Collins, 5 Jonathan Thomas, 4 Alun-Wyn Jones, 3 Adam Jones, 2 Huw Bennett, 1 Paul James.
Replacements: 16 Ed Shervington, 17 Ryan Bevington, 18 Ian Gough, 19 Filo Tiatia, 20 Jamie Nutbrown, 21 Gareth Owen, 22 Nikki Walker.
Dragons: 15 Will Harries, 14 Adam Hughes, 13 Rhodri Gomer Davies, 12 Pat Leach, 11 Richard Fussell, 10 Jason Tovey, 9 Wayne Evans, 8 Lewis Evans, 7 Gavin Thomas, 6 Andrew Coombs, 5 Hoani MacDonald, 4 Robert Sidoli, 3 Ben Castle, 2 Tom Willis, 1 Aaron Coundley.
Replacements: 16 Lloyd Burns, 17 Pat Palmer 18 Jevon Groves, 19 James Harris, 20 Tom Riley, 21 Adam Greendale, 22 Jonathan Evans.
Referee: Nigel Owens (WRU)
Assistant Referees: Gwyn Morris (WRU), Wayne Davies (WRU)
TMO: Nigel Whitehouse (WRU)