Lewis Hamilton says there was nothing to learn from the opening day of free practice for the Japanese Grand Prix as rain washed out any significant track action at Suzuka.

With the weather expected to be better over the remainder of the weekend, Hamilton admits there was little use in wasting mileage on the car, saying Mercedes learned enough about the car in wet conditions in 2014.

With this in mind, Hamilton spent his day practising starts and shaking down over a few laps, even if he did end FP2 with the third fastest time.

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"Have you heard of the phrase diddly squat? That's exactly what it is today," he told reporters. "Every time you get in the car you learn something but today's not been particularly fun and there's not been much to learn. We learned it all in the last race here when it was raining, so not learning much, much more today.

"You don't want to take too many risks, damaging a car or a gearbox, so today we were just practicing starts and getting a few laps. The balance is going to be so much different so it's irrelevant what we do today because they say it's going to be dry. It's a shame for the fans as a lot of people turned up today."