1920 U.S. National Championships – Men's singles

Bill Tilden defeated Bill Johnston in the final, 6–1, 1–6, 7–5, 5–7, 6–3 to win the men's singles tennis title at the 1920 U.S. National Championships. It was Tilden's first U.S. Championships singles title, the first of an eventual record seven such titles, and his second major singles title overall.