Gavin Henson booted a 50-metre penalty to earn the Ospreys a last-gasp Celtic League win over Glasgow Warriors.
Glasgow had led 13-5 at half-time when Sam Pinder charged down Shaun Connor's kick to score, Dan Parks adding a conversion and two penalties.
But wing Richard Mustoe gave Ospreys hope with a try before half-time, then Steve Tandy crossed after the break.
A Connor penalty tied the scores to ensure a tense finale, with Wales and Lions centre Henson holding his nerve.
Ospreys: Stefan Terblanche; Richard Mustoe, Sonny Parker, Gavin Henson, Shane Williams; Shaun Connor, Martin Roberts; Duncan Jones (capt), Huw Bennett, Adam Jones, Alun Wyn Jones, Ian Evans, Jonathan Thomas, Steve Tandy, James Bater.
Replacements: Richard Hibbard, Andrew Millward, Lyndon Bateman, Des Dillon, Jason Spice, James Hook, Andrew Bishop.
Glasgow: Graydon Staniforth; Rory Lamont, Hefin O'Hare, Andrew Henderson, Mike Roberts; Dan Parks, Sam Pinder; Kevin Tkachuk, Scott Lawson, Euan Murray, James Eddie, Dan Turner, John Barclay, Donnie Macfadyen, Jon Petrie (capt).
Replacements: Fergus Thomson, Lee Harrison, Craig Hamilton, John Beattie, Steve Swindall, Calvin Howarth, Spencer Davey.
Referee: Alain Rolland (IRFU).