Russell Knox has won twice on the PGA Tour -9: R Knox (Sco); -8: S Burns, B Hoag, C Percy (Aus); -7: B Steele, P Perez Selected others: -4: S Lowry (Ire), M Laird (Sco); -3: B Taylor (Eng); E: S Garcia (Spa)
Russell Knox of Scotland shot a nine-under-par round of 63 to take the lead after the first round of the first event of the new PGA Tour season.
Knox, 35, carded seven birdies and hit the 550-meter fifth hole at the Safeway Open in California.
Americans Bo Hoag and Sam Burns, as well as Cameron Percy from Australia are second in eighth place.
"I definitely feel my game is heading in the right direction," said Knox, who last won the Tour in 2016.
"For the past two weeks I've been working as hard as ever for this event, so it's really nice to see something good happen immediately."
Ireland's Open Champion Shane Lowry, who said he wanted to make up for a disappointing end to the previous campaign, is back five strokes with a share of 21st with Scotland's Martin Laird, while England's Ben Taylor shot 69th and 36th jointly is.
Thirteen players have yet to complete their opening round after the game was interrupted because of darkness, although no one is in a position to threaten Knox's leadership.