Russell Henley got off to a quick start in the US PGA Tour FedEx Cup playoffs Thursday, firing a six-under 64 to lead the Northern Trust by one stroke from top-ranked Dustin Johnson.

Johnson, whose early-season surge saw him win the Genesis Open in Los Angeles and two World Golf Championship titles to reach number one in the world before injury forced him out of the Masters in April, notched his lowest round since February.

He shook off an early bogey to post four of his six birdies on the back nine en route to his five-under 65.

Henley admitted he "didn't really know what to expect" in his first competitive round on the Glen Oaks Club course in Old Westbury, New York.

But he benefitted from benign early conditions to make eight birdies.

That included a chip-in at the fifth hole, but mostly relied on his determination to keep the ball in play.

"I just tried to hit the fairway, make sure I hit the green when I was in the fairway, and the greens are great and I rolled in a couple of putts," he said.

Henley, who won the Houston Open in April, thrived in the morning as stars including Hideki Matsuyama and Rory McIlroy struggled.

Colombian Camilo Villegas and Americans Scott Brown and Chris Kirk shared third on 64.

Henley's showing was a turnaround from his last two starts, in which he finished tied for 66th and 71st.

"My attitude was just bad," he said of those outings, but the start of the playoffs, the four-tournament series capped by next month's Tour Championship, has him feeling energized.

He came into the post-season 19th in the standings and on course to reach the season finale -- where a $10 million bonus is on offer to the series points winner -- for the second time.

Matsuyama came in atop the standings, but had four bogeys in his last six holes in a four-over 74.

McIlroy, the defending FedEx Cup champion whose season has been hampered by injury carded a 73, unable to build any momentum in his bid to gain a first victory of the year.

Major winners Bubba Watson and Louis Oosthuizen were among half a dozen players sharing sixth on 67.

Justin Thomas, who won his first major title at the PGA Championship and came into the tournament second in the playoff standings, was in another big group on 68 while British Open champion Jordan Spieth -- third in the standings -- got off to a solid start with a one-under par 69.

source: AFP