Jenson Button finished up third quickest on day one of the post-Spanish Grand Prix test after a "seamless" day at the wheel of his McLaren.

The Briton, who was ninth in the race on Sunday, was actually quickest in the morning, fractionally ahead of Sebastian Vettel, after posting a 1 minute 23.753 second lap on the super soft tyres. Although he did not improve in the afternoon, his earlier time was good enough to leave him P3 overall, 0.533secs off the top time.

In total he did 86 laps, focusing on aero correlation in the morning and longer runs in the afternoon.

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"Today was a seamless day of testing - with both the team and car working well throughout the day, it's satisfying that we were able to complete day one of the test according to plan," said McLaren-Honda team manager, Dave Redding.

"We'll look to run a similar programme tomorrow with [third driver] Stoffel [Vandoorne], refining today's work and gathering yet more data ahead of next week's Monaco Grand Prix."

Meanwhile, Honda used the running to focus on getting the power unit ready for the trip to the Principality.

"Today's power unit run programme consisted mainly of race set-up for the Monaco Grand Prix," confirmed Honda's R&D principal engineer, Satoshi Nakamura. "The street circuit of Monaco has many slow corners which require stability in the engine's low-revving range, so we focused on its driveability and the various modes of the power unit to bring out its full potential. Our plan is to continue to run similarly tomorrow. We are looking forward to the second day of testing."