Masters champion Danny Willett is one shot off the first-round lead at the BMW PGA Championship after carding a six-under-par 66 at Wentworth.
Willett, 28, who won his first major last month, sank six birdies in a bogey-free round to trail YE Yang, Joost Luiten and Scott Hend.
Fellow Englishman Robert Rock is five under; Luke Donald is one further back.
Former world number one Donald, who beat Lee Westwood in a play-off to win the Wentworth crown in 2011 and successfully defended the title 12 months later.
Willett finished 11 shots behind winner Rory McIlroy at the Irish Open and wants the same support the four-time major winner got in his home event.
Defending champion Byeong-hun An held the early lead when he carded four birdies in succession from the fourth but a scrappy back nine saw the South Korean sign for a level-par 72.
Danny Willett 10/3 to win, Luke Donald 12/1 with BetVictor