A last-gasp Shane Williams try helped Ospreys to a 31-12 victory over the Dragons and kept his team on course for a home play-off spot.
It what may be his last appearance at home before retiring at the end if the season, it was fitting that Shane Williams led the Ospreys out for this Welsh derby, and scored what could be a crucial try right at the end of the game.
Despite a ferocious start by the Ospreys two Lewis Robling's penalties gave the visiting side the lead.
The Ospreys pressure did eventually pay off when a Ryan Jones try and a Dan Biggar penalty took them into a 10-6 lead.
Only a dogged Dragons defence was preventing a fluid Ospreys side from extending that lead with try saving tackles from Aled Brew and teenager Hallam Amos reinforcing this.
Repeated infringements at the scrum led to the sin-binning of prop Nathan Buck and the Ospreys were awarded a penalty try to increase their lead to 17-6 going into the break.
Robling's third penalty of the game reduced the Ospreys lead to 17-9 just minutes into the second half. When Biggar cynically tripped Brew, referee Nigel Owens had no choice but to yellow card the fly-half.
Robling's fine kicking display continued with his penalty taking to score to 17-12 with a quarter of the game remaining.
The scrum woes continued for the Dragons as Dan Way was sin-binned for an illegal bind.
The Ospreys sheer dominance at the scrum led to the second penalty try of the game. Biggar's simple conversion extended their lead to 24-12.
In trademark fashion, Williams scored and converted the bonus-point try with the final move of the game.
Tries: RP Jones, Williams, Penalty 2
Cons: Biggar 3, Williams
Pens: Robling 4