Holcombe Ward defeated William Clothier in the all comers' final, 10–8, 6–4, 9–7 to win the men's singles tennis title at the 1904 U.S. National Championships.

[2] Reigning champion Laurence Doherty did not defend his title in the Challenge Round.

The event was held at the Newport Casino in Newport, R.I., United States.

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