Rayo Vallecano looked like they were set to progress in a thrilling second leg at Mestalla, only to be dramatically denied a place in the last 16

Valencia battled back to draw 4-4 with Rayo Vallecano in the second leg of their Copa del Rey round of 32 tie on Tuesday, sealing a stunning 6-5 aggregate victory.

Rayo had looked on track to triumph when they led 4-2 on the night and 5-4 on aggregate with just under 30 minutes remaining but goals from Paco Alcacer and Rodrigo saw the hosts progress.

An own goal from Rayo defender Morcillo just after the break had dragged the tie to 4-4 - although the visitors led on away goals - and Adri Embarba's fine finish in the 61st minute put the Madrid-based club further on top.

Valencia had entered the contest with just one win in their past five league games but were able to turn their poor form around in the cup competition.

A driving counterattack saw Alcacer score in the 65th minute - the 21-year-old striker notching his brace after scoring the opening goal - while Rodrigo struck the winner with 19 minutes left in controversial circumstances.

Alcacer challenged Rayo goalkeeper Cristian Alvarez in the air, making contact with the gloveman, but the referee ignored the visitors' pleas for a foul, as Rodrigo smashed his volley into the net.

Elsewhere, Almeria won 2-1 at home to defeat Real Betis 6-4 on aggregate, while Celta Vigo claimed their first win in seven games in all competitions, winning 4-1 against second-tier Las Palmas to complete a turnaround from the first leg and progress 4-3 on aggregate.