Valtteri Bottas topped the timesheets on the final morning of pre-season F1 testing in Spain, while McLaren's last chance for mileage took another blow as technical issues crept in once more.

Utilising the super-soft tyres, Bottas stopped the clock with a 1min 23.063secs lap, placing him on top of the timesheets for the morning session, albeit three tenths shy of overall benchmark Nico Rosberg on the soft shod Mercedes from Friday.

For the time being, Bottas was comfortably faster than Sebastian Vettel in the Ferrari, the former champion producing a 1min 23.469secs lap as the manufacturer turns its attention to improving its single lap pace on this final day of testing action.

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Felipe Nasr accumulated a further 71 laps in the Sauber en route to third best, while Sergio Perez got his first laps in the VJM08 and was immediately up to speed, setting the fourth fastest time over 54 laps.

Rosberg, meanwhile, topped the timesheets early on with his medium-shod effort, but focused on mileage mostly with a 68 lap total and fifth overall, ahead of Toro Rosso's Max Verstappen.

Meanwhile, Red Bull's final day started badly when Daniel Ricciardo's RB11 came to a halt at the end of the pit lane early on. Having managed just 10 laps prior to the stop, the Australian wouldn't make it out again before lunchtime.

Similarly, McLaren's hopes of a final flourish of laps at the end of a test period beset by constant problems came to an early end when more engine issues consigned it to the pit lane until just five minutes before the end of the morning session. With just a single afternoon remaining, Jenson Button hasn't completed a full lap yet today.