Coast Guard officials wouldn't speculate on the men's chances of being rescued alive as the search continued early this morning. There was some hope, even though hypothermia can set in after 18 hours in 64-degree water. Water temperatures were in the mid- to upper-60s.

"With all of these men being past, present Football players, they do have a much larger physique than a lot of people," Petty Officer Robert Simpson said. "So their odds are going to be definitely in their favor."

The lone survivor so far, Nick Schuyler, was conscious but appeared weak as he was loaded onto a stretcher Monday. His father, Stuart Schuyler, said the former University of South Florida player was bruised and dehydrated but "looks OK." He said his son was in serious but stable condition.

Crews narrowed their search Monday for Lions free-agent defensive lineman Corey Smith, 29; Oakland Raiders linebacker Marquis Cooper, 26, who owned the 21-foot boat; and former South Florida player William Bleakley, 25. Smith is 6-foot-2, 250 pounds, and Cooper is 6-foot-3, 230 pounds. Bleakley had played tight end at South Florida, which listed his playing size as 6-foot-3 and 240 pounds.

Nick Schuyler told rescuers that the boat the four good friends were aboard was anchored when it flipped Saturday evening in rough seas, Coast Guard Capt. Timothy M. Close said. Schuyler, who was wearing a life vest, had been hanging onto the hull that a Coast Guard cutter discovered 35 miles off Clearwater.

The men's families have said they had life vests and flares aboard.

Schuyler's mother, Marsha Schuyler, said her son told her he survived by thinking about how he didn't want her to go to his funeral.

The family's joy for him being found alive was tempered by the search for his friends.

"We still have three men missing, and we're not going to talk too much until we find these guys," said his father. "We're all praying for them. These guys are all very close friends."

Searchers had previously covered 16,000 square miles of ocean, but the area being searched was much smaller since they found Schuyler, Close said.

Bruce Cooper, the father of Marquis Cooper and a prominent sportscaster in Phoenix, said Monday the family has been overwhelmed with calls, e-mails and text messages from well-wishers. He and other family members were in Tampa awaiting news on the search.

"We remain hopeful that Marquis will be found and returned to us," Cooper said.

Smith's family planned to drive Tuesday to Florida from Richmond, Va., after the snowy weather in the East made getting a flight impossible, said Yolanda Newbill, one of Smith's sisters. She said they have been in contact with the Coast Guard every few hours since the search began.

"We have total faith that (he) will be coming home," Newbill said.

James Allen, a marine safety consultant who once worked search and rescue operations with the Coast Guard, said the chances of finding survivors diminish after people have been in the water three days.

Survivors have been found who were floating for days, but he added "you just can't swim forever."

The four men left Clearwater Pass early Saturday in calm weather, but heavy winds picked up through the day and the seas got rough, with waves of 7 feet and higher, peaking at 15 feet on Sunday.