The 22-year-old Briton, a former Walker Cup teammate of world No. 9 Rory McIlroy, was one stroke ahead of Australian Richard Green. Sharing third place on 67 were Britons Ross Fisher and Richie Ramsay and India's SSP Chowrasia.

Willett made a fast start under cloudless skies at Wentworth, reeling off five birdies in seven holes on the way to an outward 31.

The young Englishman continued to make light of the new, toughened-up West Course with a dynamic birdie hat-trick from the 16th.

"The greens are a bit slow compared to past years and I holed quite a few putts," Willett said.

"They are rolling really well with the new grass down and if you get a good pace you can hole them well."

Willett said he had been excitable since his days as a brilliant young amateur but was starting to improve his demeanor thanks to coach Graham Walker and caddie Malcolm Mason.

"I am a bit hot-headed," he said. "I'm fairly giddy all the time. Maybe not playing as good as I feel I should ... gets me a bit hot under the collar.

"But working with Malcolm and Graham, we have come out of that quite a bit. It's getting better."

Willett enjoyed a good rookie campaign last year, registering eight top-10s.

He has maintained that form this season by finishing in a tie for fourth place at the Joburg Open, sixth in the Malaysian Open and joint seventh at the Hassan II Trophy in Morocco.

"I'm always trying to win, every week I come out," said Willett. "It's been good mentally this year and even if I'm not hitting it perfect, I'm swinging it perfect.

"It would be good to win but it's not a necessity this year. It will come soon if I just keep playing good golf."

While the little-known Willett was feasting on the new-look West Course, some of the bigger names went through a bit of a famine.

World No. 6 Ian Poulter slumped to a seven-over 78, talented German Martin Kaymer had a 76 and former Ryder Cup player Darren Clarke slid to a 75.

"I didn't hit it good," a stony-faced Poulter said. "I don't know what you want me to say, how much more I can elaborate.

"You can see my scorecard, I didn't play very well. If you don't play well on this golf course it's going to punish you."

World number seven Ernie Els, who masterminded the changes, opened with a 69 while triple major winner Padraig Harrington carded a triple-bogey eight at the 17th on the way to a level-par 71.

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