Barcelona F1 test: Daniel Ricciardo, Red Bull lead Friday morning

After ending the first day of the second test openly admitting engine supplier Renault's performance was not where Red Bull needed it to be, Ricciardo gave both parties a welcome boost on Friday.

The Australian set a 1m24.574s on soft tyres in the final hour of the morning session, and with 64 laps on the board ensured the team completed the second-highest amount of mileage as well.

As Ricciardo was returning to the pits, Raikkonen's own soft-shod effort fell 0.010s short of beating him, just as Sergio Perez attempted to grab the headlines in the 2014 Force India on the super-soft tyre.

The Mexican had been the early pacesetter, having been the first onto the soft tyre, but could only find a small improvement on the red-walled Pirellis.

Behind the top three, which was separated by just 0.128s, a fit-again Nico Rosberg completed a highly-productive morning for Mercedes.

The 2014 F1 runner-up logged 66 laps as he focused on longer runs on the medium tyre, and was less than a second behind Ricciardo despite not completing a lap on the soft-compound Pirellis.

Fernando Alonso surpassed McLaren-Honda team-mate Jenson Button's day-one total as the Spaniard completed 28 laps.

The double world champion was able to perform meaningful medium-tyre runs but the team's ongoing wait for a replacement MGU-K seal means longer running remains a challenge.

Williams's low-key second test continued as Felipe Massa focused on a series of short runs, though the Brazilians did top the times early on in the morning.

Sauber's Marcus Ericsson, GP2 champion Jolyon Palmer (in his first test for Lotus) and Toro Rosso rookie Carlos Sainz Jr completed the leaderboard.

DAY TWO MORNING TIMES: