Colin Gregor kicked all Glasgow's points before limping off

The Welsh region, given confidence by a twinkle-toed performance by Shane Williams, had opened up a 21-9 lead at half-time with three converted tries.

They had to wait until the 78th minute to register the fourth try - the only score of the second period - and the bonus point.

But the Ospreys started poorly, going 6-0 down after leaking two Colin Gregor penalty goals in the first nine minutes.

The hosts seemed to get their game on track when a pick-up in his own half by James Hook resulted in Scotsman Nikki Walker breezing in for their opening try.

Glasgow nipped back into the lead for a second time only two minutes later when Gregor converted a third penalty before limping off.

But for the rest of the half it was all Ospreys as they scored two more tries in the space of nine minutes.

First a period of pressure was converted by a try for centre Scott Parker, celebrating his 50th appearance for the Welsh region.

Good work by New Zealander Filo Tiatia saw his fellow countryman Justin Marshall go on a run to the left corner. When he was brought down just metres short, the hard-working Tandy was on hand to score the third try.

Glasgow missed an opportunity to close the half-time gap to just nine points when Dan Parks missed a penalty in injury time.

The Ospreys went in search of a bonus point but it took them until the 14th minute of the second half to get their first chance.

Henson made a 40-metre break and a try looked certain but his pass outside failed to find Tandy wide open in the Glasgow 22.

But that was a rare opportunity as Glasgow, who had off-loaded their whole replacements bench 16 minutes from time, seemed to get stronger.

The Ospreys finally broke the second-half deadlock, however, grabbing the bonus point with a fine set-piece move from a five-metre scrum which saw man of the match Shane Williams go over in the right corner.