Ospreys coach Steve Tandy praised his young side after Morgan Allen's last-gasp try gave them a dramatic 33-27 LV= Cup victory over Gloucester at the Liberty Stadium.
The hosts had led 26-13 with eight minutes to go but a Dan Murphy score and a penalty try put the Aviva Premiership side ahead by a point with time running out on a rain-sodden encounter. But the Ospreys responded emphatically, driving number eight Allen over the line against some tentative defence to seal an excellent win.
Tandy said: "It was more nail-biting than I would have liked, if we had not come away with the spoils I would have been disappointed."
He added: "But it was testament to the maturity the guys showed to try and build for a penalty first and then to go for a try, that was the icing on the cake. They thoroughly deserved the win.
"We had lots of young guys out there and all in all it was a real positive night for Ospreys rugby. I probably got a bit carried away at the end because I know what that meant to the group. But we had some guys tonight making their debuts or only their first or second starts and it is something we can feel really positive about."
Wing Tom Grabham also crossed for the Ospreys, with fly-half Matthew Morgan kicking four penalties and two drop goals, while replacement Sam Davies, son of Gloucester boss Nigel, slotted five points.
Gloucester director of rugby Davies, meanwhile, had few qualms with the result, but was frustrated by how the Premiership team had let the game slip away from them at the death.
He said: "We just didn't manage the game and the conditions well enough. The Ospreys handled that far better. We put a lot of pressure on ourselves for a large amount of the time. They had a better kicking game than us, we had no length and no accuracy with that. That was the deciding factor, we need to play the game in the right areas and we just couldn't do that.
"It was fantastic to see the way the boys fought back. But it was sloppy in the end to leak that try, having worked so hard to get back in front.
"We probably didn't deserve the lead but because of our resilience that's what comes with it. And we should have nailed it and finished it off right there. But If I'm honest it's a fair result, I don't think we could have expected much more."