Ireland's Shane Lowry tied for the lead in Phoenix after stunning 65
World number four Rickie Fowler is in a three-way tie at the top of the leaderboard after the opening round of the Waste Management Phoenix Open in Arizona.
Fowler posted an impressive 65 and is joined on six-under by Ireland's Shane Lowry and Japan's Hideki Matsuyama.
Starting on the back nine, Fowler struck six birdies and an eagle, but was hurt by two bogies on the 16th and 18th.
Lowry carded eight birdies in his 65, but hit back-to-back fives at five and six, while Matsuyama also registered eight one-unders and two bogies.
One of Lowry's birdies came at the notoriously difficult Par-3 16th and he was particularly pleased with it.
"It's very intimidating up there," Lowry told the Golf Channell. "First time I've done it, obviously. I was just praying I was going to hit the green.
"My ball managed to just stay on the green, and I rolled it in from 30 feet. It was pretty exciting, and it was nice to do that."
Anirbahn Lahiri and Bryce Molder are a shot further back on five-under. Molder was unable to complete his round as bad light brought an end to play with him having completed 16 holes.
England's Greg Owen is the highest-placed European after a 67 while Phil Mickelson and Bubba Watson are further back on two-under.
USA's Bradley Keegan would have been in tied-fourth on five-under, but he was hit with a two-stroke penalty after taking to the course with 15 clubs instead of the permitted 14.
Greystones' Paul Dunne has continued his solid form on from Torrey Pines and is -1 after completing 13 holes before play was stopped.
Padraig Harrington is four shots further back on three over par.