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.
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