It was better than that, flying fast into the shaggy collar atop the steep bunker and onto the fringe, where he rolled in a 30-foot eagle putt.
With two birdies and one clutch par save, Thomas closed with a 5-under 66 for a three-shot victory over Spieth that sent him into the off week feeling better than ever about his game, and his year.
And barring Spieth winning the final two FedEx Cup events to claim the $10 million bonus, Thomas became a heavy favorite to be voted PGA Tour player of the year.
Needing an eagle to stay in the game on the par-5 18th, Spieth pushed a 4-iron into a tough lie in the bunker, blasted over the green and made bogey for a 67.
The PGA Tour heads into a dark week with Spieth, Thomas, Johnson, Hideki Matsuyama and Jon Rahm in the top five in the FedEx Cup.
- Thomas adds to breakout year by separating from tight packArkansas Online
- Justin Thomas runs away from big names to collect Dell Technologies crownBoston Herald
- Justin Thomas holds off Jordan Spieth to win Dell Technologies ChampionshipGolf.com
- Golf: Justin Thomas holds off jittery Jordan Spieth to win Dell ChampionshipThe Straits Times
- Thomas earns sixth career win at Dell Technologiespgatour.com
- Justin Thomas earns fifth victory of the season at Dell Technologies ChampionshipGolfDigest.com
- Grades: Justin Thomas gets 5th win of season at Dell Technologies ChampionshipCBSSports.com
- Dell Championship: Justin Thomas beats Jordan Spieth to win title in BostonBBC Sport
- The clubs Justin Thomas used to win the Dell Technologies ChampionshipGolfDigest.com