The victory came after a play-off last night.
Abraham Ancer is a World Golf Champion for the first time.
The Mexican claimed the St Jude Invitational after a play-off last night.
He birdied the second play-off hole to overcome Hideki Matsuyama and Sam Burns, after all three finished on 16-under-par.
Rory McIlroy shot a third successive 66 to finish in a tie for 12th on ten-under.
Shane Lowry was four shots further back on six-under.