UPDATE 2: After the session Marquez received treatment for 'mild neck and back pain'.

UPDATE 1: Marquez is preparing to go back out on his spare bike, Lorenzo fastest

Rookie Marc Marquez, who can win the MotoGP title this afternoon, has fallen hard in Sunday morning practice at Motegi.

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The Repsol Honda star was holding third fastest at the halfway stage of this morning's extended 45-minute free practice when he slid off at Turn 12 and cartwheeled roughly through the gravel.

The visor was ripped from his helmet in the incident and the 20-year-old limped slowly away before catching his breath and checking his arm and shoulder movement.

Marquez has an 18-point lead over Yamaha's Jorge Lorenzo heading into this afternoon's penultimate round. Marquez needs to increase his lead to 26 points in Japan to avoid a final round showdown.

After a wet and disrupted weekend, Sunday is dry and bright.