Jackie Sharborough, 6, of the Vicksburg, Miss, swim team, set 24 state age-group records at distances from 25 yards to 50 meters in freestyle, back, breaststroke, butterfly and individual medley. She also won her team high-point trophy for 8-and-under girls.
Gerard Coleman, 17, competing for the Larchmont (N.Y.) Yacht Club, won the junior sailing championship of Long Island Sound, skippering a Fireball to four firsts and a second. Coleman had previously won the New York Yacht Club's junior regatta.
Bill Walker, 38, a Detroit truck driver, set an American record of 8:37:57.5 in the 50-mile walk. The old mark of 8:47:17 was recorded in 1966. The versatile Walker was American and Canadian lightweight double sculls champion in 1956-57 and 1960-61.
James Hartung, 15, of Omaha, Neb., won the side horse, the parallel bars and vaulting events to take the overall championship in the senior boys (15-18 years) gymnastic competition during the National AAU Multisport Junior Olympics meet in Ithaca, N.Y.
Kendra Smith, 18, of Salt Lake City, led her team to a 16-0 record in the Western Boys Baseball Association. Her three-year record is 48-4 as the only female coach in the league. She will attend College of Eastern Utah on its first woman's athletic scholarship.
Reginald Shamberger, from Carmichael, Calif., won the heavyweight division for 9-year-olds at both the U.S. Judo Association tournament in Decatur, Ill. and the U.S. Judo Federation championships in Denver. Reggie has competed for 2� years.