Trump began with four straight bogeys before carding a six-under 41 on the front nine. She then had two double bogeys and three more bogeys on the back nine.
The $3.25 million The ANNIKA at Pelican in Belleair, Florida, is the penultimate event of the LPGA season, which will conclude with the Tour Championship November 20-23 in Naples, Florida.
It traditionally attracts a strong field and was won in 2024 by American star Nelly Korda.
Korda opened with a one-over 71.
Other sponsor invitations have gone to Wake Forest University senior Anne-Sterre den Dunnen of the Netherlands (two-over) and Northwestern University standout Lauryn Nguyen (one-over).