Toyota's Anthony Davidson says he remains weary of the rival Audi threat as the race for the WEC title begins to hot up at this weekend's American round at Austin, Texas.

Having walked away from Le Mans with only a third place finish to their name, despite being the faster package all week at the famous Le Sarthe circuit, the #2 Audi, led by an inspired Andre Lotterer, has closed the gap to the #8 Toyota to now 20-points as the season re-starts in Austin.

Davidson's team mate Nicolas Lappiere was caught out by the surprise monsoon rain shower early in the race and clattered the TS040 machine into wall, losing eight-laps in the process and costing Toyota any realistic chance of victory.

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"It feels like such a long time since we were racing at Le Mans," said Davidson. "For a racing driver it is massively frustrating to be out of the cockpit for three months so I am raring to go and I cannot wait for it all to start in Austin. It's a great track; one that is really enjoyable to drive.

"We go to the US leading both championships and the target is clearly to extend our advantage this weekend. We know it will not be easy and I am sure our rivals have not stood still in the last three months but we are ready for the challenge."

Their third driver, Sebastian Buemi, believes the Circuit of Americas layout should suit the Toyota given the fact the Hybrid challenger has arguably been the fastest package so far this year.

"There is tough competition but we should be optimistic because the TS040 HYBRID has been the car to beat this season," said Buemi.

"The track should suit our car pretty well and I have good memories of last year when we had a great battle for the win."