Shane Williams's script writer surely hails from Hollywood. The wing marked his final appearance for Wales with a try against Australia in December from the final play of the game and on Sunday he clinched the RaboDirect Pro12 title for Ospreys with his second try of the match three minutes from time, his last touch of the ball in competitive rugby.

Like his first try on 58 minutes, he had to wait for the video official to confirm the score after Rob Kearney had tried to get under the wing to prevent the ball being grounded, but he knew what the verdict would be. He had appeared on his opposite wing as Ospreys pressed for the winning score, leaving Dan Biggar with a conversion from wide on the right which the outside-half put through the middle of the posts to deny the Heineken Cup holders the double.

Williams, despite the hot weather and intent of both sides to move the ball, was on the periphery of the action for the most part but he has made his name in his 15-year professional career as an opportunist who has the ability to turn a match in an instant. He may be 35, but retirement looks premature.

"I have had a blast but it is time to do something else now," said the wing, who is due to play for the Barbarians against Wales in Cardiff on Saturday in what will be his career's final match. "I have had a lot of fun and will miss it, but to go out with a trophy was everything I could ask. We dug deep and I knew I had to do something at the end."

Leinster lacked the intensity they had shown against Ulster the week before and lost to Ospreys in the play-off final at their RDS ground in Dublin for the second time in three years. Although they led for long periods and were nine points up with seven minutes to go, they struggled up front after the prop Mike Ross limped off 14 minutes in and they had two props sent to the sin-bin for collapsing. The match finished with uncontested scrums.

Ospreys scored 17 of their points when they had a man advantage, although the felt aggrieved at the end of the first-half, when they trailed 17-9, not to have been awarded a penalty try after Leinster collapsed four scrums five metres from their own line, earning their prop Henke van der Merwe 10 minutes off.They used their man advantage to hammer away but met a blue wall until Williams, crossing from the left, squirmed through two defenders to end his long career on the highest of highs and hand Wales the Celtic league title to go with the Six Nations grand slam. "It was not our best performance of the season, but we never stopped fighting and we deserved to get something from the campaign," said Williams.

Leinster Kearney; McFadden, O'Driscoll, D'Arcy, Nacewa; Sexton, Reddan (Cooney, 76); Van der Merwe, Cronin (Strauss, 50-65), Ross (White, 14), Cullen (capt; Thorn 44), Toner, McLaughlin, Jennings (Ryan, 74) Heaslip.

Tries Nacewa 2, Cronin Cons Sexton 3 Pens Sexton 3.

Sin-bin Van der Merwe 40, White 71.

Ospreys Fussell; Dirksen, Bishop, Beck, Williams; Biggar, Webb (Fotuali' i, 54); James (Bevington, 63), Hibbard (Baldwin, 74), A Jones (Jarvis, 74), AW Jones (capt), Evans (King, 63), R Jones, Tipuric, Bearman.

Tries S Williams 2, Beck Cons Biggar 2 Pens Biggar 4.

Referee R Poite (France) Attendance 18,500.