The PGA Senior Championship is under threat of being cancelled due to some heavy rains in the "Sunshine" Sate of Florida.
Five inches of rain in 12 hours wiped out play on Friday after lightning delays in the first round held up the tournament too.
Weather permitting, the first round will be finished and the second round completed Saturday.
"It's just a bad day for everybody," said defending champion Allen Doyle, who was 1 under for 12 holes with two birdies and a bogey when darkness stopped play Thursday.
"I'd hate to be in the PGA's shoes. But you want to be sure it's playable and fair for everyone when you start playing again."
Japan's Seiji Ebihara was the clubhouse leader Thursday at 68. He had been caught at 4-under par by Doug Tewell, who birdied the 11th, 14th and 15th holes before darkness halted play.
"The course is unplayable," Kerry Haigh, Senior director of tournaments for the PGA of America, said.
"The forecast is for a slightly less chance of rain Saturday and under the best of circumstances, we will be able to finish the second round Saturday."
The PGA of America plans to start second round play early on Saturday, around 7.45am and those who did not finish the first round on Thursday will return to their positions and resume at 8 am, then go into the second round as soon as possible, Haigh said.
Plans to play Monday or even Tuesday to complete what is a major championship on the Senior PGA Tour are also being discussed. Under a worst case scenario, Haigh said, if only 36 holes has been played through Monday, the tournament could be called after 54 holes by finishing Tuesday morning.