Challenged only by the record book, Justin Thomas won the Sony Open on Sunday with the lowest 72-hole score in the history of the PGA Tour.

The win capped Thomas' wonderful week at Waialae that began with a 59 en route to his second straight victory.

He two-putted from 60 feet on the par-5 18th and closed with a 5-under 65 to set the record at 253.

Tommy Armour III shot 254 at the 2003 Texas Open.

"It's been an unbelievable week. Unforgettable," Thomas said before signing his historic card.

Make that two weeks.

The 23-year-old from Kentucky won the SBS Tournament of Champions at Kapalua last week by three shots, then destroyed the full field at the Sony Open to win by seven shots.

Thomas is the first player since Tiger Woods in 2009 (Buick Open and Bridgestone Invitational) to win back-to-back weeks by three shots or more.

"I felt like I was trying to win a tournament for second place," said Jordan Spieth, summing up the helpless feeling of the rest of the field.

The runner-up honor went to Justin Rose, who closed with a 64 to finish alone in second. Spieth carded a 63 to finish alone in third.

The first full-field event of the year on the PGA Tour was a one-man show.

Thomas began the final round with a seven-shot lead and no one got closer than five shots all day. His only nervous moment was an eight-foot par putt on the sixth hole when he was five shots ahead. He made that, and the rest of the day was a Pacific breeze.

Thomas joined Ernie Els in 2003 as the only players to sweep Hawaii, and this performance might have been even better. Thomas was 49-under par for his two weeks, compared with Els' 47-under.

Thomas joined Johnny Miller (1974 and 1975) and Woods (2003, 2008, 2013) as the only players since 1970 to win three of the their first five starts in a PGA Tour season. It started last fall with the CIMB Classic in Malaysia.

He moved to No 8 in the world.

"He's got full control of his game, full confidence, and he's executing under pressure," Spieth said.

"It's a lot of fun to see. Certainly stuff that myself and a lot of our peers have seen going back almost 10 years now."