American Brooks Koepka moved a step closer to retaining his PGA Championship title after moving into a seven-shot lead ahead of Sunday’s final round.

The 29-year-old has set the standard this week in New York and he is just 18 holes away from winning his fourth major title. Koepka broke records on day one at Bethpage Black with a round of 63 but he kept things simple on Saturday with a 70 to stay at 12 under.

He has now opened up the largest 54-hole advantage in the tournament’s history, as none of the chasing pack made any progress in the third round.

Harold Varner III, Jazz Janewattananond, Luke List and Dustin Johnson are all tied in second on five-under, while England’s Matt Wallace and Japan’s Hideki Matsuyama are a shot further back.

The length of the course in Long Island was expected to cause problems for the field but Koepka has breezed through his first 54 holes and the two-time US Open champion says he will not let up as he tries to add to his current score.

He told the PGA Tour official website: “I’m definitely not going to let up. I know guys are going to have to push on this golf course, and if you have to push, you’re going to make mistakes.

“I feel confident. I feel good. I feel excited. I was excited to get to the golf course and try to build the lead.”

Koepka’s lead means he is as short as 1.06 to win, but Johnson remains the best priced in the W/O Koepka market. He is 2.50 to finish second best, while Wallace is 17.00 to finish as runner-up.