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Paul Dunne made an impressive start to his debut event on the PGA Tour as the Greystones man shot a three-under-par 69, just three strokes off the pace.
The youngster lies in a share of 15th place, tied in a group including Patrick Reed and Phil Mickelson.
Dunne showed few signs of nerves, dropping just a single shot on his way round Torrey Pines.
Fellow Irishman Shane Lowry also made a decent start, carding a one-under 71.
The event is led after the first round by American duo Scott Brown and Andrew Loupe.
"I hit it really well coming in, the last 11 holes," Brown told the PGA Tour website. "I made a couple of length putts and capitalised on the short ones.
"It's a hard golf course, if you're out of position you are immediately playing for par. Fortunately I drove it good and hit a lot of good iron shots today.
Loupe meanwhile had a helter-skelter day, notching two eagles, four birdies and two bogeys to lead fellow Americans Billy Horschel, Patton Kizzire, Tom Hoge, Rob Hoppenheim and Harold Varner III by one shot.
Defending champion Jason Day had a round to forget as he battled a virus on his way to carding a round of 72 which leaves the world number two in a tie for 76th.