With Leicester's beleaguered forwards looking increasingly forlorn, the Ospreys squeezed further penalties from their tired and dejected opponents, with Hook adding six points with two fine penalty strikes to seal the game and the trophy.
McGeechan praised the contribution of Wales fly-half James Hook, whose 16 points from penalties and two conversions ultimately made the difference between victory and defeat.
The Ospreys had to rely on the boot of James Hook for all their points, the fly-half kicking seven out of eight penalties as Munster defended fiercely.
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Paul James's charge-down of Harry Ellis's kick nearly gave the Ospreys a dream start to the second half, but Leicester got themselves out of a corner and stayed nine points clear until Hook's penalty, which came just after Flood limped off.
Lee Byrne crossed for Wales, Stephen Jones and James Hook kicking the rest of their points in their first Six Nations defeat under Warren Gatland.
Federer claimed the first mini-break, netted another forehand to let Falla off the hook, but then won four points in a row to take the set.
But tries from Adam Jones and James Hook brought the visitors back to within three points before Haskell's breakaway effort five minutes from time clinched victory.
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Federer was in no mood to let Murray off the hook in game six after setting up two break points with a typically accurate volley and completed the break with an inside-out forehand to wrong-foot Murray and lead 4-2.
After the break James Hook's penalty cut Leicester's lead to six points.
Ireland's discipline again failed them, but this time in front of the posts, Hook sent his kick sailing through the uprights for Wales' first points.
The Ospreys started brightly, taking only a minute to gain their first opportunity to earn points, but the normally reliant boot of outside-half James Hook misfired as he sent his penalty wide.
Wales, by contrast, totalled 14 points from the boots of fly-half Stephen Jones and centre James Hook, the latter's late drop-goal giving Wales breathing space as Italy pressed in the final quarter.
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Maccarinelli had been ahead on points in the first defence of his European title but was caught by a good left-hook from Frenkel in the seventh round.
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