Keegan Bradley and Sebastian Cappelen share the Farmers Insurance Open lead as Rory McIlroy and Tiger Woods made decent starts on Thursday.
Bradley and Cappelen opened with six-under 66s at Torrey Pines, sharing a one-stroke lead on what is a congested leaderboard in San Diego.
A bogey-free opening round on the North Course set up 2011 US PGA Championship winner Bradley, who made an eagle at the par-five fifth.
Denmark's Cappelen produced his round on the South Course, mixing eight birdies with two bogeys.
Plenty of eyes were on McIlroy and Woods, who made fine starts, with the Northern Irishman particularly impressive.
McIlroy carded a five-under 67 on the North Course in a round featuring seven birdies and two bogeys.
He is in an eight-way tie for third, alongside Byeong Hun An, Joel Dahmen, Kevin Tway, Zhang Xinjun, Matthew NeSmith, Im Sung-jae and 2011 winner Bubba Watson.
A seven-time champion of the event, Woods fired a three-under 69 to be tied for 21st.
Woods made two birdies and two bogeys on his front nine before picking up shots at the first, fifth and ninth.
Jon Rahm, the 2017 winner, is among a group of 10 tied for 11th at four under, with J.B. Holmes alongside him.
Defending champion Justin Rose struggled on the South Course, shooting a three-over 75.
Jordan Spieth, meanwhile, made a solid if unspectacular start with an opening-round 70 that included five birdies.