Day, trying to win on the PGA Tour for the first time since 2018, started the final 18 holes one stroke from the overnight leader Sam Burns.

But four bogeys through his first 11 holes put the Australian star out of contention en route to a closing 71 that left him six shots behind of Mexico's Carlos Ortiz.

Ortiz held off World No.1 Dustin Johnson and Japan's Hideki Matsuyama to clinch his maiden PGA Tour title with a two-shot victory over the decorated duo.

Playing in the final group alongside Day, Ortiz also began his round one shot back of Burns.

He fired a bogey-free five-under-par 65 to reach 13 under on the week at Memorial Park Golf Course where he became the third player from Mexico to win on the PGA Tour.

That left him one shot clear of Matsuyama (63), whose red-hot finish stalled at 18 where he missed a 13-foot birdie putt, and Johnson (65), who nearly grabbed a share of the lead at 16 where his putt from 20 feet rolled just left of the cup.

Ortiz needed a closing par to secure the win but went one better when he drained a 22-foot birdie to cap the victory in his 118th PGA Tour start.

Adam Scott finished in a tie for 32nd place, bouncing back from a four-over par 74 on Saturday to shoot a final round 68.