Jon Rahm is in the driving seat for both Memorial glory as well as claiming the world number one ranking.

Jon Rahm has described his four-shot lead at the Memorial Tournament as “nothing”, admitting he’ll need to be on his guard if he is to secure both his first win of the year and the world No.1 spot.

A fine end to his round on Saturday, in which he birdied four of his last six holes, saw the Spaniard sign for a four-under 68, leaving him as the 2/9 favourite with Betfred to claim the honours at Muirfield Village having carved out a sizeable advantage.

While Rahm flourished on the back nine with his putter catching fire down the home stretch as he moved to -12, his nearest rivals struggled.

Overnight co-leaders Tony Finau (8/1 Outright) and Ryan Palmer (14/1) are tied for second on -8 but could have been much closer to Rahm were it not for a bad end to their round, Finau recording two double bogeys after the turn as he carded a one-over 73.

Meanwhile, Palmer dropped two shots over his last three holes to match Finau’s score and they are just one shot ahead of England’s Danny Willett (28/1) who produced an excellent round of 70 to move into contention at -7.

Australia’s Jason Day is a shot further back alongside Sweden’s Henrik Norlander, while England’s Matt Wallace (16/5 top five finish) sits in seventh on -4 after a two-under round of 70.

However, all eyes will be on Rahm come Sunday’s finale as the 25-year-old as he looks to secure his fourth win on the PGA Tour as well as becoming only the second man from Spain, after Seve Ballesteros, to hold the world No.1 spot.

Rahm has to win the Memorial and hope Rory McIlroy doesn’t surge up the leaderboard to finish runner-up if he is to ascend to the top of the rankings.

Despite his lead, Rahm is taking nothing for granted with conditions set to become even tougher in Ohio and says the swirling winds, hard fairways and baked out greens mean his advantage could disappear quickly if he’s not careful.

“Four shots on a windy, difficult, firm golf course is nothing. It’s me making two bogeys and somebody making one birdie and then suddenly it’s only a one-shot lead,” Rahm said.

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