Arnold Palmer missed the end of his tournament on Sunday at Bay Hill as he was taken to the hospital with blood pressure problems.
Palmer routinely greets players just off the edge of the 18th green as they complete their rounds, and then is part of the trophy presentation as well.
"During the course of the day, he had been having his blood pressure checked because he has had some issues with new medicines. He'd been advised to continue to monitor his blood pressure," explained Alastair Johnston, COO of Arnold Palmer Enterprises.
"About 15 minutes prior to the end of play, he had gone out for a routine test, and the blood pressure was at a level in which the doctor involved suggested he go immediately to get more intensive evaluation at the hospital.
"The situation is improving and nobody is overly concerned about the prognosis, but he is going to remain in the hospital overnight for observation."
Palmer missed the ending of his event in which Tiger Woods snapped a 30-month winless drought on the PGA Tour.
The 82-year-old Palmer won 62 times on the PGA Tour, including seven major championships, and 10 more times on the Champions Tour.
For the last few years, Palmer has been an honorary starter at The Masters. There was no word whether he would be able join Jack Nicklaus and Gary Player in the role again this year.