1891 U.S. National Championships – Men's singles

Men's singles
1891 U.S. National Championships
Champion Oliver Campbell
Runner-up Clarence Hobart
Score2–6, 7–5, 7–9, 6–1, 6–2

Defending champion Oliver Campbell defeated Clarence Hobart in the challenge round, 2–6, 7–5, 7–9, 6–1, 6–2 to win the men's singles tennis title at the 1891 U.S. National Championships.