1884 U.S. National Championships – Singles

Three-time defending champion Richard Sears defeated Howard Taylor in the challenge round, 6–0, 1–6, 6–0, 6–2 to win the men's singles tennis title at the 1884 U.S. National Championships. A challenge round was introduced this year, which was played until 1911. Arthur Rives became the first player to play at more than one Grand Slam singles tournament within a calendar year.