McIlroy and Power both finished on one-under-par.
Shane Lowry finished in third place at the Arnold Palmer Invitational last night.
He started the final round sharing the lead but a poor first nine allowed Scheffler to take control of the tournament.
Lowry improved on the back nine to hold onto 3rd place and scoop $1.4 million.
The Offaly man ended the week on nine-under-par, after a final round of two-under 70 at Bay Hill.
Scottie Scheffler enjoyed a five-stroke victory on 15-under-par.
Rory McIlroy and Seamus Power were both back on one-under-par.
Shane Lowry Finishes Tied 22nd At Memorial Tournament
Alex Dunne Secures Second Place In Monaco
Laois Manager Highlights Work Rate As Reason For Joe McDonagh Victory
Tailteann Cup Draw Sees Laois Face Down And Offaly Host Wexford
Clonaslee United Claim First Ever Combined Counties Cup
Third Time The Charm As Laois Claim Joe McDonagh Cup
Offaly Pupils Become Local Stars After Publishing Bestselling Book
Katie Taylor To Fight At Croke Park In September
Laois And Westmeath Set For Big Tests In Intermediate Camogie Championship
I Knew I Had To Play A Good Round To Win - Ella Cantwell
Mullingar Athletic And Clonaslee United To Clash In Combined Counties Cup Final
Shane Lowry And Rory McIlroy In Contention At Memorial Tournament
There's Serious Competition In The Laois Panel - Mark Dowling
Westmeath Ladies Look To Book All-Ireland Quarter-Final Spot
Alex Dunne Aiming For Big Weekend In Monaco
Offaly Camogie Captain Looking Forward To Kilkenny Clash
Shane Lowry In Action At Memorial Tournament
Laois Aiming To Make It Third Time Lucky In Joe McDonagh Cup Decider
Galway To Host Westmeath On Sunday June 14th
Second Round Draw Made For FAI Cup