Jason Day, the 2016 Players champion, withdrew from the tournament citing illness, the PGA Tour announced Thursday ahead of the opening round.
Day, who was scheduled to go out at 8:46 a.m. EDT with Wyndham Clark and Jordan Spieth, was replaced in the field by Danny Walker.
The 37-year-old Day was in contention last week at the Arnold Palmer Invitational before finishing with a 74 that left him tied for eighth. His most recent win came at the 2023 Byron Nelson event.
Walker, a 29-year-old Korn Ferry Tour grad, will be making his Players Championship debut.
