His three-shot lead was down to one through six holes of the Farmers Insurance Open, and the biggest battle was trying not to panic.
But the former US Open victor made a double-bogey at the par-four 14th and then found the water hazard with his second shot into the par-five 18th, two-putting for a bogey and an 18-under total after 54 holes.
Rose holed an 8-foot par putt on No. 15 with Scott in tight for birdie to keep his lead at three shots. Woods birdied his last two holes for a 31 on the front nine of the South Course and finished at 10-under par.
The smooth-swinging former world No.1, who has previously struggled on the greens, adopted an arm-lock grip several days before the US PGA Tour event at Torrey Pines.
"Just was a little shaky and I wasn't solid tee-to-green", Scott said.
Rose became the first victor to post all four rounds in the 60s since Peter Jacobsen in 1995, back when the North and South courses were 700 yards shorter.
In more ideal conditions, Rose made his only bogey of the week by coming up short of the green on the seventh hole and missing a 12-foot putt.
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"Man, I'm just not 100 percent with my golf game right now, " DeChambeau said after his 4-under 68 in the third round, which gave him a one-shot lead over defending champion Li Haotong of China.
"My drives were a lot more stable than the first day, so I was able to play comfortably".
Leader Rose ran in a series of mid-length putts, few better than a 20-footer from the fringe for eagle at the par-five ninth. He played on the South Course which is the more hard of the two.
"If you play well the course is there to be had but what I like about it is you need to be on".
"It felt great. Today's round could have gone the other way but I made a couple really good saves", Scott said.
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.
Woods enjoyed a return to form last year, the 14-time major victor ending his five-year wait for a title by claiming the Tour Championship, having impressed at The Open and US PGA Championship. "It's going to take a little bit to get my feel back".