In July 1920, the Morse company again played host to America's cup yachts when the defender Resolute and the challenger Shamrock IV were prepared for their races at the Morse yard. The company also provided entertainment for the yachts' crews."Start Measuring Rival Cup Yachts", The New York Times, 1920-07-08. Shamrock IV went on to win the first two races of the series, making her the most successful challenger to that date, but was beaten in the latter three to lose the series 3–2."Resolute Saves America's Cup", The Rudder, September 1920, p. 7.
