Kai Trump shot a 13-over-par round on her LPGA debut as she ended the first day of the Annika tournament in last place.
The 18-year-old amateur, who is the granddaughter of US President Donald Trump, hit two double bogeys and nine bogeys in her opening round in Florida.
She has played only three events this year and is ranked number 461 in the American Junior Golf Association rankings.
Trump received a sponsor’s exemption to play at the Annika but ended the first day four shots behind her closest competitor and 19 off the lead, held by South Korea’s Haeran Ryu on six under.
The LPGA said her “broad following and reach are helping introduce golf to new audiences, especially among younger fans”.
Trump has more than six million followers on social media and recently launched her own apparel and lifestyle brand.
England’s Charley Hull and Ireland’s Leona Maguire are three shots off the lead after shooting three-under-par 67s.