WGC-St Jude Invitational: Justin Thomas warms up to American PGA with victory

Justin Thomas started four shots behind Brendon Todd -13 ] J Thomas (USA); -10 B Koepka (USA), D Berger (USA), T Lewis (Eng), P Mickelson (USA) Selected others: -9 S Lowry (Ire), M Fitzpatrick (Eng); -8 D Johnson (USA); -3 T Fleetwood (Eng)

Justin Thomas warmed up for next week's American PGA Championship by the WGC-St Jude Invitational in Win memphis.

The American started four shots behind leader Brendon Todd but won three against Brooks Koepka, Phil Mickelson, Daniel Berger and Englishman Tom Lewis.

Defending champion Koepka birdied 17 to get inside one of Thomas, but was the last to find water to end his hopes.

The closing 65 gave Thomas, the 2017 American PGA Champion, his 13th PGA Tour title and a return to world number 1.

Koepka bogeyed 16 to give Thomas some breathing room, but then made a huge birdie putt on the next up close in a shot before streaming onto 18 on the way to a double bogey.

Thomas' short game on the back nine was imperious, with some world-class pitches and top-notch putting combinations to make birdies and save par.

Overnight leader Todd struggled all day and ended day four, finishing in eleventh place

Lewis finished third after his Saturday 61 was able to sue with a fine of 66.

His fellow countryman Matthew Fitzpatrick finished joint sixth out of nine alongside Irish Open champion Shane Lowry while Tommy Fleetwood was third.