Mattanawcook Academy of Lincoln junior Cayden Spencer-Thompson was a double-event winner Saturday at the 73rd New England Interscholastic Outdoor Track and Field Championships held at the University of New Hampshire in Durham. Spencer-Thompson captured both the boys long jump and triple jump in securing two of six victories by Maine participants — all high school juniors. Brewer High School’s Jacob McCluskey won the boys discus, Jason Montano of Thornton Academy in Saco won the boys shot put, TA’s Travis Snyder was tops in the boys pole vault and Nyagoa Bayak of Westbrook placed first in the girls high jump. Spencer-Thompson got off to a lofty start in the long jump, posting what turned out to be the winning leap of 24 feet, 1 3/4 inches on his first attempt. That jump, a new personal best, was exactly 1 foot longer than the 23-1 3/4 he jumped a week earlier to win the Maine Class C title and shatter a 41-year-old state record. Already an indoor All-American in the triple jump and the New England runner-up outdoors in the event a year ago, Spencer-Thompson soared to victory Saturday with a leap of 48-3 3/4.