Justin Rose equalled a record as the world number one maintained his lead after the penultimate round of the Farmers Insurance Open.
Rose had six birdies and an eagle on another pristine day along the Pacific Ocean, a big reason why scores have been so low this week on a South course that will host another US Open in two years. But he made his second double bogey of the round on No. 14, and then went for the green on the par-5 18th from the first cut of rough and went into the water to close with a bogey.
Rose holed an 8-foot par putt on No. 15 with Scott in tight for birdie to keep his lead at three shots.
The tournament's final 36 holes will be played on the South course, which was ranked the eighth hardest on the PGA Tour previous year and hosted the 2008 US Open.
Fourteen time major victor Woods birdied his last hole of the day to post a 70 and is eight shots back of Rahm at the Torrey Pines Golf Course in La Jolla, California. "If you take into account the town and the vibe around Torrey Pines, this is my favourite golf course and golf tournament".
"Just was a little shaky and I wasn't solid tee-to-green", Scott said.
Scott produced an impressive eagle in a solid second round at the US PGA Tour event at California's Torrey Pines but still finished seven shots back of Englishman Rose.
Woods went par-birdie-bogey-birdie after the turn, and he closed out the day with an 18th-hole birdie. "Just start playing like it, please", he said.More news: Yellow warning for heavy snow set for Nottinghamshire
Scott, making his debut at this tournament, didn't make a birdie until the ninth hole and missed a 20-inch par putt on the front nine.
Woods made his season debut at Torrey Pines a year ago and needed to two-putt for birdie from 90 feet on his last hole to make the cut on the number.
"I did a pretty good job of it all today", he said of his overall game. "I've got to play a little better than I have".
He will not play more than four of those events, and it could be just three.
"You play the South on the first day, you're trying to survive", Rahm said. "I felt like I drove it halfway decent today and irons were good but not great".
While he conceded to some tournament rust - this was only his second event since he won the Tour Championship on September 23 - Woods says there is far less uncertainty about what he expects out of his game.
"That's not easy to do on the South, but they're doing it right now so hopefully I can do the same on the weekend".