Tiger Woods believes the golf world should be wary that Jason Day has added another weapon to his arsenal as he continues his quest back to World No.1.
The 14-time major champion Woods says Day has developed the ability to win without his best stuff during two PGA Tour victories this year, which have propelled the Queenslander seven spots up the rankings to No.7.
Day fought the stumbles during a two-shot win at last week's Wells Fargo Championship, where he carded four bogeys during the final round.
In January, he won a second title at Torrey Pines despite opening the event with a 73 and needing six sudden-death playoff holes to defeat Sweden's Alex Noren.
The pair of victories certainly haven't come as easily as the five Day earned during a breakout 2015 season, which included a maiden major title at the US PGA Championship.
But Woods believes close friend Day is a now more complete golfer.
"Well, 2015 was one of those special years where Jason hit the ball unbelievably well," Woods said at the Players Championship on Tuesday.
"He has two wins this year, not quite as (dominant), but that's learning how to win.
"I've won numerous times not playing well but (I) found a way to score and get the job done and that's what he's doing."
Woods, who holds the record for most consecutive weeks (281) and total weeks (683) as World No.1, has no doubt 30-year-old Day can reclaim top spot.
"He's already done it, and there's no reason why he can't do it again," Woods said.
Day topped the rankings for 47 consecutive weeks before surrendering it to Dustin Johnson in February 2017, in the midst of a tumultuous year.
Day revealed in March that mother Dening had been diagnosed with lung cancer, before wife Ellie suffered a miscarriage in November while pregnant with the couple's third child.
He admitted the emotional stress affected his desire to practice as he endured a winless 2017.
But Day, who won the 2016 Players Championship, says the fire has returned as he enters a new chapter in his career.
“Everything feels balanced in my life; I've got no problems at home or distractions; I'm focused on golf," Day said on Tuesday ahead of the TPC Sawgrass event.
"Desire and hunger (are not lacking) right now and I'm very motivated to keep pushing this (form) more and more."
- Evin Priest, Australian Associated Press