Was almost embarrassed by a deflected Adriano cross in the first half, and he never seemed to lack confidence all night.
Did well to get back and block Neymar's first-half effort on the line, but he should not have allowed the Brazilian the space at the back post in the first place.
The big centre-back managed to make some decent tackles in the final third, but his positioning often meant he had to do this as a last resort. His shocking pass enabled Fabregas to fire in Barca's fourth.
Was Rayo's biggest threat in the final third as his pace caused Montoya a number of problems. Unfortunately his delivery was not always up to scratch and bar a good ball for Perea's third-minute header, he created little else.
Ended up playing in every defensive position for Rayo, but they would have perhaps been better off had he played in none. He gave the ball away far too often and on one such occasion it led to Pedro's opener.
Failed to get involved in the game and his only real contribution was to make late, clumsy challenges which served to temporarily disrupt Barca's play. He displayed little in the way of ability at much else.
A combative performance but after being moved to centre-back his lack of timing in the tackle was exposed. He was unable to get anywhere near Messi when he got on the ball and was too readily sucked out of position.
Put in plenty of effort against his former club and did not stop running for the whole 90 minutes. His delivery from free kicks was OK but he was far too easily bypassed by the slick passing play of Barcelona.
The striker received next to no service and so was unable to have any kind of impact on the game. He failed to give Pique and Mascherano anything to worry about and did not test Valdes at all.
Brought a great save from Valdes after just three minutes, but soon faded into a peripheral figure. He failed to match the attacking intent of Mojica on the other flank and offered very little down the right.
Struggled to get involved in the game and saw very little of the ball. He forced a good save from Valdes which ended up leading to his side winning a penalty.
Continued his fine form from midweek as he made some fantastic saves, particularly from Perea and Viera in the first half.
Nearly scored an own goal in the first half with an enthusiastic pass back towards Valdes that went narrowly wide of the goal.
The Brazilian almost scored with a deflected cross during the opening stages. Defensively he made a number of clumsy challenges, particularly when conceding the penalty in the first half.
The centre-back had very little to do as Bueno was extremely quiet throughout the game.
Patrolled the midfield to good effect, but he gave away far too many free kicks. It was an average performance from the Cameroonian but he failed to stand out in the absence of Busquets.
Struggled to stamp his mark on the game as Rayo pressed quickly in midfield. His passing was not up to scratch and he did not get up to help support the forwards often enough in a disappointing evening.
Used the ball well in midfield, displaying his array of passing in the middle of the park.
The Argentine stepped out from the back and played some decent passes. It was a fairly comfortable evening for him in the heart of the defence.
The Rayo defence had no answer to his mesmerising agility and close control when in possession.
Hugged the left flank and would have opened his Liga account for the Catalans had it not been for Tito's goal-line clearance. Bar an assist for Pedro's hat-trick, his end product was lacking on the whole, though.
More than staked his claim for a more regular starting spot with his first ever Barcelona hat-trick.
Brought on for Tito at half time and he failed to track Pedro as he slotted in his second shortly after the break.
Replaced Perea in the 48th minute but was unable to provide anything more in terms of attacking intent. To his credit, he chased back well to help out defensively.
Came on for Viera but was unable to stimulate Rayo in the final third.