Jim Henry, 30, Of Waitsfield, Vt., won the National Whitewater Open Canoe Championships (downriver) on Maine's Dead River. Racing a 16�' canoe he designed and built himself, Henry completed the 22-mile rapids-filled course in 3:35.21 to win by eight seconds.
Stephen Dayton, 20, of Indianapolis, took the 121-mile senior men's road race in the National Amateur Bicycling Championships at Salem, Ore., covering the distance in 5:41:19.7. Dayton, a junior at Purdue, hopes to compete in the 1972 Olympics.
Debbie Halle, 16, of Seattle, won the girls' 15-18 gymnastics all-round title in the AAU Junior Olympics at the Air Force Academy. She scored 69 points out of a possible 80, several times receiving grades of nine (out of 10) from judges on individual events.
Larry (Sam) Blair, 13, of Elk Grove, Calif., beat a record field of 272 to win the Ail-American Soap Box Derby in Akron. He earned a $7,500 college scholarship by racing his Golden Bullet at speeds up to 35 mph on the 953'9" asphalt course.
Bob Kouwe, 23, a former Syracuse University basketball player, birdied two of the final three holes for a 145 (72-73) to win the Francis Ouimet Memorial golf tournament in Auburndale, Mass. by one stroke. He also won New York's Finger Lakes tournament.
Corky Linfoot, 20, of Pleasanton, Calif., scored three goals to lead the Green Hill Farm Club of Tulsa to an 8-6 victory over Milwaukee in the finals of the National 20-goal polo tournament. He has overcome the polo handicap of being a natural lefthander.