Live updates from what looks set to be a dramatic day of MotoGP, Moto2 and Moto3 races in Argentina!

After a dry Friday and Saturday, rain has arrived on Sunday, creating further turmoil following Saturday night's announcement that Michelin was withdrawing both rear tyres after a failure so Scott Redding.

A new stiffer tyre was to debut on Sunday, with an extra practice planned first thing this morning - but the rain meant it was cancelled.

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If the track now dries for the race, riders will be able to use the original tyre allocation but must make a pit stop to change bikes halfway through...

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