John Quinlan, 15, of Turtle Creek, Pa., practicing to make his high school golf team next year, scored three holes-in-one in a single day on a 61-par layout at Penhurst (Pa.). His aces came on two 120-yard eight-iron shots and a 145-yard six-iron shot.

Sally Crimmins, 13, of Noroton, Conn., using her little sister and a neighborhood boy as crew, sailed her Blue Jay to a victory during the Larchmont (N.Y.) Race Week, and won the Commodore's Cup for best junior skipper, all to the chagrin of her male opponents.

Benson R. McLendon, 16, of Montgomery, Ala., who has collected five state golf titles in quick succession since May, added the state's amateur title by beating Ed Brown, 38, in Montgomery, thus becoming Alabama's youngest champion in 40 years.

Jeannie Thompson, 17, a 110-pound Tulsa schoolgirl, defeated two members of America's Curtis Cup team as she won the women's Trans-Mississippi golf tournament in Wichita, Kans. She first overcame Clifford Ann Creed, and then beat Ann Casey Johnstone in the finals.

Barry Houser, 16, a regular first baseman for the Cumberland County (Pa.) Junior Legion, found time to play a game for a sandlot Mechanicsburg team that needed a pitcher. The result: a no-hitter. Returning to his regular nine, he obligingly threw another one.

Larry Poe, 17, of Seattle, who attended a month-long modern pentathlon clinic at Fort Sam Houston with 21 other teen-agers, ended his training by taking first place in riding, the 4,000-meter run and fencing to win the junior pentathlon title with 4,725 points.