Luis Suarez and Lionel Messi both scored hat-tricks as Barcelona demolished 10-man Valencia 7-0 in their semifinal first leg at the Camp Nou.
Suarez bagged an early brace before Messi scored twice either side of the interval to take his career tally to 500 goals. Neymar missed a penalty in a one-sided first-half, but Messi completed his hat trick late on.
The Uruguayan then headed in his third before claiming a fourth in the closing stages as the cup holders heaped more pressure on Los Che manager Gary Neville.
Neville's side were looking to put their league woes behind them, having failed to register a win in eight La Liga games since he was appointed in December.
But the visitors got off the worst possible start after seven minutes. Neymar dispossessed Andre Gomes inside the Valencia half before playing through Suarez, who fired a low shot past Mathew Ryan.
Barca were on the front foot once again as Neymar picked out Messi, who set up Suarez, but Jose Gaya was able to block the former Liverpool man's shot.
Suarez, though, made it 33 goals in 33 appearances moments later as Sergio Busquets floated in a beautifully weighted pass into the path of Alex Vidal and his first-time pass was blasted past Ryan by the Uruguayan.
Valencia struggled and things got worse for Neville's side as the hosts grabbed a third goal on the half-hour mark.Andres Iniesta found Neymar on the edge of the area before the Brazilian's backheel found Messi, who slotted home.
Daniel Parejo headed over as the visitors had a rare glimpse of goal, but they were lucky not to concede a fourth in the closing minutes of the first half.
Messi smacked his effort off the crossbar before Shkodran Mustafi was given his marching orders after denying a goalscoring opportunity for his challenge on the Argentine inside the box. And with virtually the last kick on an eventful opening period Neymar missed the penalty as his shot hit the post.
Pique, Messi and Busquets had chances to stretch the lead further after the break before the Blaugrana fans were on their feet again as the Argentinian superstar grabbed his second.
Suarez turned provider as his flick found Messi, who shuffled past hapless Valencia defenders before firing into the bottom corner -- his 500th career goal for Barcelona.
Valencia thought they had scored a consolation in the 67th minute, but Rodrigo's effort was ruled out for offside.
But soon Parejo carelessly lost possession before Messi beat Ryan at the near post, and Barca made it 6-0 as Suarez completed his hat-trick when Sergi Roberto found him at the far post.
And he increased the visitors' misery as his 35th goal of the season, with next week's second leg at the Mesalla a formality.