Y.E. Yang, Scott Hend and Joost Luiten shot 7-under 65s to share the lead after the first round of the BMW PGA Championship at Wentworth on Thursday.

Danny Willett, the Masters champion and the only member of the world's top 20 competing in the tournament, was a stroke behind after a bogey-free 66 in good scoring conditions at the European Tour's headquarters.

Defending champion Byeong-Hun An held the early lead when he rolled in four straight birdies from No. 4. He covered the back nine in 40 to shoot a level-par 72.

Fellow South Korean Yang, who won the U.S. PGA Championship in 2009, made a bogey on the opening hole and reacted by rolling in eight birdies — including on Nos. 17 and 18.