"I was walking past the fence, getting ready to go into the pool," the visitor to Hendersonville, Tenn, related, "when I heard this lady screaming, "Oh my God, oh my God, I can't get him up."

Told by Margaret Hudson that her nephew, 9, was in trouble underwater, the visitor dove into the apartment complex pool. Without his contact lenses, he couldn't find the lad, Stephen Ferguson, at once, "but I came up and yelled for someone to get an ambulance and then went back down and pulled him up. He was unconscious so he wan't struggling or anything."

Mrs. Hudson and son Mare, gave Stephen artificial respiration until an ambulance arrived; the boy was treated at a hospital and released.

That was Monday. Yesterday, the youngster said he felt fine-and the identity of his rescuer came to light.

"The last time I was here and people found out where I was and who I was," said the hero, who had been visiting relatives, "I got all these life insurance salesmen and people wanting to promote various things knocking on the door."

Way to go, Jake Scott, of Falls Church, Va. The Redskin safety still has a lot of Dolphin in him . . .

Bob Frailey, American U's athletic director, entered Washington Hospital Center yesterday for coronary hypass surgery. Nothing sudden, a planned followup after his recuperation from his heart attack last year . . . Joe Louis, ailing in Las Vegas several months since his heart operation, got the word that if Detroit City Council votes, as promised, to honor the request of a citizens "Committee to honor Joe Louis," the new riverfront sports arena will be named for the old heavyweight champ who grew up in Motor City. "Our prupose is to honor him while he still responsive and still with us," said group spokeswoman Mary Clavon; the champ responded that when they dedicate the arena, for which the foundation has been poured in anticipation of September 1979 opening for Detroit Red Wing hockey, "I will be there, God willing" . . . It wasn't "Jimus Palmera" disease, after all, as suspicious Baltimoreans hinted when Nolan Ryan missed a start against Orioleace; that is a doggone serious hamstring tear in his pushoff lef that has the Angel falmethrower on 21 days" disability . . . And Wimbledon will have to do a little reseeding for its grass-courts special, now that the No. 11 woman, Rosie. Casals, has had knee surgery . . .

Remember from the Orioles, tryout camp 9 a.m. tomorrow at D.C.'s Baneker Stadium, 2500 Georgia Ave. NW; bring your gear, lads says scout Dick Bowie . . . Switch in Oriole TV coverage 1979-82; WMAR-TV-2 picks up the ball for 52 games annually, same number WJZ-TV-13, which closes out 15 consecutive years (19 of 21) as O's outlet, has been carrying . . . Park's July 2 Swaps Stakes (and risk the 1977 fate of Seattle Slew, defeat), says trainer Las Barrera . . .

He's Number One in the District, says Hertz of Anthony Fields, inviting him with number ones from 50 states to a July 11 New York City dinner with awards presentation by O.J. Simpson, who else Hertz decided Fields Interhigh sprint record-smashing for H.D. Woodson was the top D.C. athletic performance of the year.