Real Zaragoza were denied three vital points in their bid to escape relegation from the Primera Division as Osasuna snatched an equaliser amid late drama at La Romareda.
Helder Postiga thought he had earned the home side, who sit bottom of the table, a vital win when he scored the opening goal with just four minutes to go.
But Osasuna, who have European ambitions this season, earned a 1-1 draw when Roversio headed an equaliser with two minutes remaining.
It was particularly bad luck for Zaragoza who had several opening and were twice denied by the frame of the goal before Postiga opened the scoring.
Osasuna started the brighter but a shot from Raul Garcia missed right and then Zaragoza's Postiga was also off target.
Zaragoza goalkeeper Roberto Jiminez kept out a shot from Damia Abella and then saved a header by Roland Lamah from a corner.
Abella's foul on Angel Latifa earned Zaragoza a free-kick but they were denied by the woodwork as Postiga's header from Luis Garcia's ball in came back off the bar.
Lafita's shot from the right side of the penalty area brought a save out of Osasuna keeper Andres Fernandez as both sides continued to look for the opener.
Zaragoza went close to taking the lead three minutes into the second half when they again hit the woodwork, Latifa's left-footed shot from 12 yards coming back off the post.
Luis Garcia shot on the hour was parried by Fernandez in the Osasuna goal.
The home side were denied again when a free-kick 25 yards out by Luis Garcia was hit straight into the Osasuna defensive wall.
Escudero shot over the bar for the visitors before Zaragoza's Tomislav Dujmovic shot narrowly wide from close range.
Zaragoza looked like they had claimed all three points when Postiga shot in from long range following a pass by Antonio Apono with four minutes remaining.
But two minutes later Osasuna snatched a share of the points when Roversio headed in from close range after a corner from Alvaro Cejudo had been headed back across goal at the far post by Escudero.
