Rayo seals stunning win over Osasuna
Jose Maria Movilla got the hosts off to the perfect start as he volleyed home on five minutes before Michu headed in his first from Tito's cross.
Michu tapped home his 15th goal of the season 11 minutes later after a fine run and cross by Diego Costa and the Brazilian himself curled in a wonderful fourth before half-time.
Osasuna coach Jose Luis Mendilibar attempted to stem the tide with three substitutions at the break but the goals continue to come for Rayo as Emiliano Armenteros rounded off a fine team move and Tito completed the rout with an easy finish 11 minutes from time.
Rayo had lost their previous three games, conceding 10 goals in the process, but it was Osasuna who suffered a hangover from their 5-1 defeat to Real Madrid last weekend as they were repeatedly torn apart by the pace and power of the hosts' front four.
Movilla expertly guided home his second goal of the season when Andres Fernandez could only parry a cross to the edge of the box, but the keeper redeemed himself 10 minutes later as Rayo somehow failed to double their lead when Piti hit the crossbar, Michu prodded the first rebound against the post and then saw his follow-up effort stopped on the line by Andres.
The second did soon arrive and it was Michu who got it as he towered above the Osasuna defence to meet Tito's cross from the right.
And the former Celta Vigo man had his second of the afternoon when more good work down the right from Costa left him with the easiest of finishes from 10 yards out 11 minutes later.
Costa had been a constant menace for the visitors and he got the goal his performance deserved nine minutes before the break when Michu released him down the left and he cut inside to fire a wonderful effort low inside Andres' left-hand post.
Mendilibar showed his disgust with his team's first-half showing by introducing Ibrahima Balde, Alvaro Cejudo and David Timor at the break. However the switch to a back three did not prevent Rayo creating opportunities and Armenteros swept home their fifth goal at the end of a flowing move again involving Costa and Michu.
The Navarrans' day was summed up a minute later when their best move gave Raul Garcia the chance to pull a goal back but his effort struck the outside of the post.
Osasuna still looked porous at the back and conceded again despite a fine double save from Andres to deny Costa and Michu from point-blank range as the ball fell kindly for Tito to stroke home his first goal in La Liga.