The Ospreys grabbed the win they needed, beating high-flying Glasgow 26-16 at Firhill on Friday in the Magners League.
The Welsh side were 16-6 down at the break, but added 20 unanswered points in the second period spurred by Tommy Bowe's touchdown.
With two defeats in their opening three Magners League outings, the Ospreys looked to their returning Lions to make an impact, but it was Glasgow who made the early running.
Graeme Morrison made the hit from Dan Parks' kick-off, Ospreys offended at the first scrum and Parks nailed the penalty.
He repeated the dose after a Rob Dewey intrusion had created panic in the Ospreys defence.
With 10 minutes gone, the Ospreys scrum splintered the Glasgow pack on their put-in and, from the kick to the corner, Dan Biggar dropped the goal which fired up an Ospreys side who had looked sluggish until then.
Parks missed with a drop-goal attempt and Ospreys roared back downfield.
Mike Phillips and Ryan Jones made the yards and, when the penalty came, Biggar had no problem levelling the scores.
By the half-hour mark, both sides had had chances - Shane Williams for Ospreys and Morrison for Glasgow - but defences ruled until Dewey shredded the Ospreys defence with a 55-metre break.
Parks' pin-point cross-kick found Kelly Brown lurking on the opposite touchline and his flick infield found David McCall for the try.
Parks converted from the touchline to take Glasgow in 16-6 ahead at the break.
A Biggar penalty two minutes into the second half narrowed the gap but big hits by Moray Low, Brown and John Barclay slowed any Ospreys momentum until a Lee Byrne break after 50 minutes put Williams away, only for the flyer to be hauled down two metres short.
Ospreys kept up the pressure, and despite some feisty Glasgow defence, a crafty jink put Tommy Bowe over for Biggar's conversion to level the scores.
The Ospreys number 10 smacked over his third penalty and Glasgow started to wilt as the Ospreys big men Ryan Jones and Jerry Collins bullied the home side at the breakdown.
Substitute Nikki Walker rubbed salt in the wound scoring against his countrymen with Biggar's conversion taking the Welshmen comfortably clear of their hosts.
Pens: Parks 2
Drop goal: Parks
For the Ospreys:
Tries: Bowe, Walker
Cons: Biggar 2
Pens: Biggar 3
Drop goal: Biggar
Yellow card: Parker (Ospreys, 53)
Glasgow: 15 Bernardo Stortoni,14 Rob Dewey,13 Dave McCall,12 Graeme Morrison,11 Thom Evans,10 Dan Parks, 9 Chris Cusiter, 8 Johnnie Beattie, 7 John Barclay, 6 Kelly Brown, 5 Alastair Kellock (c), 4 Tim Barker, 3 Moray Low, 2 Dougie Hall, 1 Jon Welsh.
Replacements: 16 Fergus Thomson, 17 Kevin Tkachuk, 18 Dan Turner, 19 Richie Vernon, 20 Mark McMillan, 21 Colin Gregor, 22 Hefin O'Hare.
Ospreys: 15 Lee Byrne, 14 Tommy Bowe, 13 Sonny Parker, 12 James Hook, 11 Shane Williams, 10 Dan Biggar, 9 Mike Phillips, 8 Ryan Jones (c), 7 Steve Tandy, 6 Tom Smith, 5 Andy Lloyd, 4 Alun-Wyn Jones, 3 Craig Mitchell, 2 Huw Bennett, 1 Paul James.
Replacements: 16 Richard Hibbard, 17 Duncan Jones, 18 Ian Evans, 19 Jerry Collins, 20 Jamie Nutbrown, 21 Gareth Owen, 22 Nikki Walker.
Referee: Simon McDowell (Ireland)
Assistant referees: Rob Dickson (Scotland), Graham Allen (Scotland)
Television match official: Andy Macpherson (Scotland)
Assessor: Jim Fleming (Scotland)