There's likely been a time since then when Mickelson has been the favorite through 54 holes, though in each of his two PGA Tour victories during this time - last year's AT&T and the previous year's WGC-Mexico Championship - he came from behind in the final round, so perhaps this is indeed "new" old territory for him.
15 and 17 for a 2-under 70 round and a four-stroke win over Kevin Streelman, with Mickleson fading to five shots back with three bogeys on his back nine.
Mickelson was going for a record sixth title at Pebble, but Taylor had a five-shot lead at the turn.
Instead, Taylor won a PGA Tour event for the second time of his career and set himself up for an exciting 2020 season.
Having won the Sanderson Farms Championship in November 2014, Taylor joined Mike Weir and Stephen Ames as the only Canadians in the modern era to win twice on the top men's tour. Ayean Choi had a one-shot lead over Madelene Sagstrom going into the final round.
However, Mickelson fell short to take complete benefit as he required 4 strikes to discover the placing surface area prior to cutting the side with his par effort, as well as Taylor instantly looked an invigorated number when he compensated a woeful wedge right into 15 by damaging in for an invaluable birdie. He pierced a couple of big shots like that eagle in six, and the putts he made in four, five and seven, and he really played A great golf. "The wind rose towards the end of that front nine, and I was holding there, and some bad units that I didn't think were too bad, but ended up in bad points and just tried to drive my way from there".
"I had to remind myself I still had the lead, I knew I was swinging it well and just needed to hit that fairway", Taylor said.
Australia's Jason Day is well-placed in second, after a superb 64 took him to 12-under overall. I've just got to do my own thing, try to block all that out. I holed a good par putt on the first and that really settled me down.
"It also helped that I holed a great chip for a birdie at the 15th". And obviously, to enter the next hole and recover a shot was massive.
Leading Mickelson by one to start the day, he built his lead to five strokes at the turn only to see it dwindle to two through 14 as players battled in rapidly falling temperatures and gusting winds.
But Taylor reinforced his hold on the competition when he pierced a pure eight-iron to 6 feet at the penultimate opening as well as rattled in the putt for birdie, as well as a traditional the same level at the 72 nd opening finished a two-under 70 as well as a four-shot success with a winning rating of 19 under the same level.
Taylor overcame 40 miles per hour gusts of winds and finished at 19-under to become the first Canadian to win the event at Spyglass Hill Golf Course.
The five-time major champion also made history - his 30th consecutive season with a top-10 finish. "Once I get on the green, around the greens, I feel like I'm pretty comfortable".
"There's a lot of positives that I take out of today".
"It's not fun hovering around that 125", Taylor said of past struggles to keep his playing privileges on the PGA Tour. It marks the first time four Canadians will tee-off at the Masters. He won $1.404 million. "I mean Nick played better than I did". "It was huge and it just gives me great confidence moving forward".