Andrew Loupe and Scott Brown shot six-under par 66s, Loupe on the North Course, Brown on the South at Torrey Pines, and are tied for the lead after the first round of the Farmers Insurance Open in San Diego.
Defending champion Jason Day and Rickie Fowler, who won the Abu Dhabi HSBC Golf Championship on Sunday, both struggled. Day, ranked second in the world, shot an even-par 72 on the North Course and is tied for 74th place. Fowler, ranked fourth in the world, shot a one-over 73 on the North, and is tied for 89th.
"It's [the North Course] a lot of fun and adds a little bit of different characteristics than just having the South Course," Fowler said. "I feel like they have toughened it up over the past couple years as far as bringing the rough a little bit more into play, with it being a little bit longer and thicker."
San Diego native Phil Mickelson, a three-time winner at Torrey Pines, shot a three-under 69 at the South Course and stands tied for 15th.
Billy Horschel, Patton Kizzire, Tom Hoge and Rob Oppenheim are tied for third, each with five-under par 67s.