|Farmers Insurance Open first-round leaderboard|
|-6 Brown (US), Loupe (US); -5 Horschel (US), Oppenheim (US), Kizzire (US), Hoge (US), Varner III (US); -4 Choi (Kor), Matsuyama (Jpn), Steele (US), Woodland (US), Stallings (US), Every (US), Hadland (US); Selected others: -3 Laird (Sco), Dunne (Ire); -1 Lowry (Ire), Rose (Eng); E Day (Aus), Davis (Eng)|
American Scott Brown hit eight birdies in his final 11 holes to share the lead at the Farmers Insurance Open.
The 32-year-old joins compatriot Andrew Loupe at the top of the first-round leaderboard in San Diego following a six-under-par 66.
Australian defending champion Jason Day, who has been suffering with a virus, carded a 72 at Torrey Pines.
Scotland's Martin Laird is the best-placed Briton in tied 15th, after a three-under round of 69.
Ireland's Shane Lowry and England's Justin Rose are one under in a tie for 54th.
American Rickie Fowler, who won last week's European Tour event in Abu Dhabi, struggled with his putting in his one-over-par 73.