Win important for my confidence - Nadal

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Rafael Nadal says his confidence was boosted after comfortably beating Stan Wawrinka in his ATP World Tour Finals opener in London.

The world number five took advantage of an error-riddled display by the Swiss to win 6-3 6-2 and continue his late-season revival.

Nadal - who has won 14 of his past 18 matches following a disappointing third-round exit at the US Open - raced to victory with Wawrinka making 35 unforced errors.

The 14-time grand slam winner said he was feeling strong after getting off to the perfect start.

"I'm very happy to be back, the last year has been tough," the 29-year-old Nadal told the BBC.

"Without any doubt, this is one of the best tournaments in the world, in a great city. I'm very happy to start like this, that's important for my confidence.

"The last couple of weeks I've been playing well. I have the same motivation, the same spirit to keep improving my tennis."

Nadal will face Andy Murray on Wednesday.