Today's front-page headlines from Marca, AS and Mundo Deportivo.

The Kun threat
The worst possible rival falls to the Camp Nou
The star-studded duel sees two friends meet; Kun and Messi
Navas, Negredo and Silva add to the rivalry
Tata does not fear Pellegini: "We will be well-prepared"
A possible Sevilla derby in the quarters
Maradona asks that the Balon d'Or go to Cristiano Ronaldo
Spanish Fiscal Authority to investigate Rosell and Neymar's contract
11 'Cholos' against the seven-time European champions
Atletico who are in great form meet Milan and Kaka, a sleeping giant
A game among many difficult tests
Schalke play Real Madrid and they are a comfortable rival amid a tricky fixture list
The worry is that Madrid have only one win in 25 games in Germany
Salvo gets rid of Djukic, Pizzi and Ayala are possible replacements

The Good; Schalke v Real Madrid
The Bad: Milan v Atletico
The Ugly: City v Barcelona
Madrid satisfied with their rival
Atletico motivated by the unfriendliness of Muntari
Ferran Soriano, Txiki, Aguero, Silva, Negredo, Pellegrini
Europa League: Ruban Kazan v Betis, Maribor v Sevilla, Dynamo Kiev v Valencia
"Messi has had many injuries, Ronaldo deserves the Balon d'Or," Maradona
Maradona votes for Ronaldo
Salvo fires Djukic: Nico Estevez, the technical coach, will take over for games Nastic and Madrid
Del Bosque to give his 30-man list on 15 May and those in the final 23-man squad on the 25
Martino gives a break to Pique and Busquets
Xavi is out injured

Big Match
City v Barca in the knockout rounds
The best duel in the Champions League promises to be a great spectacle full of stars and old friends
Tata: "They will not have liked the draw either"
Pellegrini: "I believe that Barca should be real worried"
Schalke v Real Madrid: Easy for Los Blancos
Milan v Atletico: A great but under-par rival
Puyol returns to Camp Nou
Rosell and Iniesta near an agreement
Djukic is gone and Estevez takes over
Premier League: Villas-Boas out after 0-5 loss to Liverpool