Rory McIlroy fired a six-under par 66 to share the lead with American Daniel Berger and Mexico’s Abraham Ancer after round one of the Hero World Challenge.

Americans Webb Simpson, Brooks Koepka and Justin Thomas share fourth on five under.

Thomas lost the lead after stumbling to a closing double bogey.

The event, featuring 17 of the world’s top 25 golfers, was not contested last year because of the Covid-19 pandemic.

‘Good response’ to double bogey

World number eight McIlroy birdied three of the first five holes but but then suffered the setback of a double bogey at the ninth.

The 32-year-old Northern Irishman began the back nine with back-to-back birdies and added an eagle at the par-four 14th.

McIlroy followed with a birdie at the par-five 15th and parred in from there.

“I was really proud of myself after that double bogey. I played the back nine five-under. That was a good response to that little setback,” McIlroy said.

“I played the par-fives at par. That’s not good enough to win out here. I can’t rely upon doing what I did today over the next three days.”

McIlroy, who has bounced back after a disappointing performance in Europe’s Ryder Cup loss to the United States in September, seeks his third victory of the year after PGA titles at Quail Hollow in May and the CJ Cup in suburban Las Vegas in October.

“I set my standards a little higher than that, but I think I turned a corner after the Ryder Cup,” McIlroy said.

“My game today has been a continuation of how I’ve felt. I left a few out there today. Overall. the game is feeling a lot better.”

‘A little rusty but pretty good’

Berger, playing his first event in 88 days since the 2020-21 season-ending Tour Championship in Atlanta in September, opened with four birdies and added another at the seventh.

Ranked 17th, Berger eagled the par-five 11th but took a bogey at the par-three 12th before answering with a birdie at the par-five 15th. A botched chip at 18 led to a closing bogey.

“It’s a great field and when you show up here you want to win,” Berger said. “A little rusty, haven’t played in a while, but I did pretty good.”

‘A very solid round’

World number 12 Ancer, who won his first PGA title in August at Memphis, made birdies at the third and seventh before closing the front nine with a bogey, then followed with birdies on five of the next seven holes.

“Very solid round. Happy with all of my bag,” Ancer said. “The highlight was definitely my putter. I rolled it nicely.”

Thomas birdied the first three holes and added back-to-back birdies at the sixth and seventh. After a bogey at the par-three 12th, the world number six birdied three in a row starting at the 14th to seize the lead at seven under.

But Thomas found a bush off the 18th tee and missed a six-foot curling bogey putt to double bogey the last and fall back.

Four-time major winner Koepka birdied the fourth, sixth and seventh, then began a run of three birdies in a row at the par-five ninth.

But he fell out of a share of the lead with a bogey at 13 and parred his way to the clubhouse from there.