But its competitors are not far behind. Two-time winner Brooks Koepka was slow and steady in his movement until a shot behind Mickelson.
Heading into the final day of the PGA Championship, he appears to be nervous with many big names in contention, with 2010 Open winner Louis Oosthuizen just one shot behind Koepka.
Hot start, sloppy finish
Playing in the final couple of the day with South African Oosthuizen, Mickelson started off as a house on fire.
His conduct was precise and his short game was more deadly than ever; a frightening combination for one of its competitors.
On his first 10 holes of his third round, Mickelson – decked out in black from head to toe – tallied five birdies, at one point, gaining a five-stroke advantage.
However, as the round progressed, the 50-year-old hesitated.
He picked up a bogey on the 12th hole and disaster hit the 13th. Mickelson and Oosthuizen both dove into the water, with Mickelson finally having to settle for a double bogey.
He managed to close the rest of his round with a series of starts, including a spectacular save on the last hole, leaving him in the lead with just 18 holes to go.
Meanwhile, in a previous couple, Koepka went about her business.
After a few early bogeys in his first nine, Koepka showed his major winning pedigree and mental toughness in the back nine, three birdies and his only shot that fell on the last hole to his frustration.
The four-time major winner, who is still recovering from an injury that has hampered him for a while now, is still unable to fully bend down to read putts, but produced remarkable golf to tame a tough Kiawah Island course .
With conditions likely to make scoring difficult tomorrow, it looks like a low score could be a 2021 PGA Championship winner.
And with Koepka and Mickelson in the lead when it all kicks off on Sunday, Mickelson will have a chance in history – looking to become the longest-serving big winner in golf history.
You Can Read Also