Stuart Isaac, 12, an Amherst, N.Y. junior-high-school swimmer, clipped .2 second off the national age-group 50-yard breaststroke record with a 31.6 in an AAU meet in Latham, N.Y. He also won the 50-yard butterfly (30.1) and 100-yard individual medley (1:07.5).
Ed Walsh, a Delanco, N.J. plastics manufacturer and two-time national Thistle champion, tried for the 10th time and finally won the midwinter Thistle title on Tampa Bay near St. Petersburg with 2-8-1-4-1 finishes as his wife, Marge, and daughter, Linda, crewed.
Kathy Gibbons, a sixth-grader at Catalina School and a member of the Valley of the Sun Track Club in Phoenix, recorded the fastest mile for girls 13 and under when she ran a 5:35.3 in an open AAU meet in her home town after training only a month for the distance.
Marvin Winkler, a 6-foot-3 senior forward on Indianapolis' Washington High state champion basketball team, scored 543 points in 20 games to break Oscar Robertson's 10-year-old regular-season city record of 541 points in 21 games. He ended the season with 590 in 22.
Bob Quinn, a 24-year-old Army veteran from Somerville, Mass. who plays forward on Boston State College's hockey team, gained his second straight national scoring title with 71 points on 33 goals and 38 assists and led his team to an undefeated (20-0)season.
Larry Engelhardt, a Manchester, N.H. high school senior, broke two world snowshoeing records at an International meet in Hartford, Conn. when he ran the 100-yard in 12.4 (1.8 seconds under the old mark) and the 220-yard in 30.9 (1.1 seconds off the record).