Ten-man Osasuna roared back from a three-goal deficit to secure a 3-3 draw at Malaga on Sunday, giving the Pamplona-based side the away-goal advantage in their Copa del Rey matchup.
Malaga had gone up 3-0 early in the second half, but forward Roberto Torres pulled one back from long range in the 57th before crossing for the unmarked Manu Omwu to head in Osasuna's second goal four minutes later.
Malaga still appeared set to win the first leg when Osasuna's Raoul Loe was dismissed with his second booking in the 64th, only for Emiliano Armenteros to follow up his own rebound in the 78th to pull Osasuna level for good.
''The game turned against us, but we stayed patient, worked the ball and we're able to turn it around,'' said Torres, who added that he was confident his team would advance to face the winner of the tie between Real Madrid and minnow Olimpic Xativa.
Malaga also finished with 10 men when Ignacio Camacho saw red for bringing down Jordan Loties from behind in the 84th.
Malaga's first-year coach Bernd Schuster was at a loss to explain his team's collapse.
''It's difficult, very difficult to understand,'' said Schuster.
Malaga is 15th in the 20-team Spanish league, just two points from the relegation zone. With this latest draw, it has just one win in its last 10 games.
''It's tough to see what we need to do to win a game if we can't do it after leading 3-0,'' Schuster said. ''We are able to fall apart all by ourselves. The only thing that was lacking was (Osasuna's) fourth goal. I was expecting it after Camacho's red card. It was the only thing missing to round off the night.''
Elsewhere in the round of 32, seven-time winner Valencia was held to a 0-0 draw at third-division Nastic Tarragona, while Espanyol needed a late goal from Christian Stuani to secure a 2-2 draw at second-division Real Jaen.
Odion Ighalo scored two goals to guide Granada to a 2-0 win at second-division Alcorcon.
Almeria struck three times in 11 first-half minutes to earn a 3-1 victory at second-tier Las Palmas.
Valencia was fortunate not to head back to Mestalla with a loss after being outplayed by Nastic, whose pair of Ivory Coast forwards Junior Wakalible and Jean Luc Gbayara ran amok in the visitors' defense.
Valencia will miss Brazilian striker Jonas for the return leg against Nastic after he was dismissed with a second booking in the 87th.
Espanyol took control after midfielder David Lopez scored in first-half injury time, but Jaen came back to take the lead after Sidnei scored an own goal in the 65th and Jozabed Sanchez netted five minutes later.
The match swung back to finally favor Espanyol when Stuani headed in a corner kick with two minutes to play to give his team the away-goal advantage entering the return leg.
At Alcorcon, Ighalo headed in Fran Rico's free kick to open the scoring for Granada on the half-hour mark, and the Nigerian striker added a second goal in the 81st minute after expertly wrong-footing his marker on the break.
Almeria striker Oscar Diaz scored two goals to fuel its big win in the Canary Islands.
The return legs will be in two weeks' time.
