(CNN) The only person who can beat Brooks Koepka heading into the final round of the US PGA is likely to be himself.
The all-powerful Koepka leads by seven shots after two record-breaking rounds and a solid third to leave the field trailing in his rearview mirror at Bethpage, New York.
The defending champion shot a level-par 70 on a breezy, sunny Saturday on Long Island to reach 12 under as he tightens his grip on a fourth title in his last eight majors.
The muscular Floridian will play Sunday alongside countryman Harold Varner III, who heads a chasing quartet at five under alongside another American Luke List, Thailand's Jazz Janewattanond and Koepka's close friend Dustin Johnson, the world No.1.
The 29-year-old Koepka has been impregnable this week, blending his brute force with a killer short game, deft putting touch and seemingly unflappable, single-minded demeanour.
His opening 63 was a course record and his 65 Friday gave him the lowest 36-hole score in major history. His seven-shot lead heading into the final round is also a US PGA record.