Phil Mickelson reached the turn at Kiawah Island's Ocean Course four shots clear of his nearest US PGA Championship rivals, before sinking a birdie on the 10th.

Mickelson – a PGA championship winner in 2005 – was in sensational form in South Carolina over the first two days and carried the same level of performance into Saturday's play.

He was four under through the first eight holes, though did make his first mistake of the day on the ninth, dropping his drive short and left of the green, but recovered to make par.

That had him on 32 through nine, with Louis Oosthuizen, tied for second on five under, going through in 36.

Tied with Oosthuizen were Masters champion Hideki Matsuyama and Branden Grace, while Brooks Koepka was at four under when reaching the turn, but nosed himself up to T2 with a 12-foot putt.

But the chasing pack were further behind when Mickelson rolled a birdie putt in on the 10th to move to 10 under.

Thumbs: Activated.pic.twitter.com/soGH6Q8wZc

— PGA TOUR (@PGATOUR) May 22, 2021