Chaz Davies says he was disappointed with the decision by doctors to declare him unfit to start the second World Superbike Championship race at Laguna Seca after crashing out of the first.

A hugely frustrating day for the Welshman, who was considered a challenger for race wins having qualified on the front row and been one of the pace setters throughout free practice, Davies' challenge came to an abrupt end on the second lap of race one when he fell at the high-speed turn six.

Falling 'awkwardly' on his head, though Ducati rider Davies was able to walk away from the accident, doctors would prevent him from making it to the start of the second race as well.

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Leaving him with no points show for on a weekend where he looked strong, Davies was understandably upset with the outcome.

"It was a strange crash as I didn't feel like I was doing anything different to normal. The rear just came around on me and I fell awkwardly on my head. It seems as if the doctors made a decision based on the fact that I was dizzy and disorientated.

"A huge disappointment because I feel ok and wanted to race of course. Anyway it's ultimately the doctors decision but a really disappointing end to what started out as such a positive weekend."