Imelda Waldron is one of two Guamanians to have conquered the Seven-Star Abbott World Marathon Majors Challenge - a mettle-testing feat requiring runners to finish major marathons in Berlin, Boston, Chicago, London, New York, Sydney and Tokyo. Waldron, who finished Sydney in 2024, was the first. Arvin Cubacub, also in Sydney, accomplished it in 2025. In August, also in Sydney, Cameron O’Neal will go for his seventh star.